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Add Windows/Cygwin depexts for tools

Tools (versus libraries) have a single package on Cygwin which is used
by both the Cygwin build of opam and also by the native Windows builds
of opam.

Cygwin build: os = "cygwin" & os-distribution = "cygwin"
Native Windows: os = "win32" & os-dstribution = "cygwin"
(or os-distribution = "msys2")

Hence os-distribution = "cygwin" is a good filter for these shared
depexts.

Changed files
+12
packages
conf-aclocal
conf-aclocal.1.0.0
conf-asciidoc
conf-asciidoc.1
conf-cmake
conf-cmake.1
conf-findutils
conf-findutils.1
conf-jq
conf-jq.1
conf-libtool
conf-libtool.1
conf-perl-ipc-system-simple
conf-perl-ipc-system-simple.1
conf-python-3
conf-python-3.1.0.0
conf-python-3.9.0.0
conf-python-3-7
conf-python-3-7.1.0.0
conf-time
conf-time.1
conf-zig
conf-zig.1
+1
packages/conf-aclocal/conf-aclocal.1.0.0/opam
···
["automake"] {os-distribution = "nixos"}
["automake"] {os-distribution = "arch"}
["system:automake"] {os = "win32" & os-distribution = "cygwinports"}
+
["automake"] {os-distribution = "cygwin"}
]
depends: ["conf-which" {build}]
synopsis: "Virtual package relying on aclocal"
+1
packages/conf-asciidoc/conf-asciidoc.1/opam
···
["asciidoc"] {os = "macos" & os-distribution = "homebrew"}
["asciidoc"] {os = "macos" & os-distribution = "macports"}
["system:asciidoc"] {os = "win32" & os-distribution = "cygwinports"}
+
["asciidoc"] {os-distribution = "cygwin"}
["asciidoc"] {os = "freebsd"}
["asciidoc"] {os = "openbsd"}
["asciidoc"] {os = "netbsd"}
+1
packages/conf-cmake/conf-cmake.1/opam
···
["devel/cmake"] {os = "netbsd"}
["devel/cmake"] {os = "dragonfly"}
["system:cmake"] {os-distribution = "cygwinports"}
+
["cmake"] {os-distribution = "cygwin"}
]
synopsis: "Virtual package relying on cmake"
description:
+1
packages/conf-findutils/conf-findutils.1/opam
···
["findutils"] {os-distribution = "ol"}
["findutils"] {os-distribution = "arch"}
["system:findutils"] {os = "win32" & os-distribution = "cygwinports"}
+
["findutils"] {os-distribution = "cygwin"}
# ["findutils"] {os = "freebsd"} # this installs g* packges, e.g., gfind. Unless code looks for those specific names, it is not necessary to install on freebsd
]
synopsis: "Virtual package relying on findutils"
+1
packages/conf-jq/conf-jq.1/opam
···
["jq"] {os = "freebsd"}
["jq"] {os = "macos" & os-distribution = "homebrew"}
["system:jq"] {os = "win32" & os-distribution = "cygwinports"}
+
["jq"] {os-distribution = "cygwin"}
]
synopsis: "Virtual package relying on jq"
description:
+1
packages/conf-libtool/conf-libtool.1/opam
···
["libtool"] {os-distribution = "ol"}
["libtool"] {os-distribution = "rhel"}
["system:libtool"] {os = "win32" & os-distribution = "cygwinports"}
+
["libtool"] {os-distribution = "cygwin"}
]
synopsis: "Virtual package relying on libtool installation"
description: """
+1
packages/conf-perl-ipc-system-simple/conf-perl-ipc-system-simple.1/opam
···
["perl-IPC-System-Simple"] {os-distribution = "fedora"}
["perl-ipc-system-simple"] {os-family = "arch"}
["system:perl-IPC-System-Simple"] {os = "win32" & os-distribution = "cygwinports"}
+
["perl-IPC-System-Simple"] {os-distribution = "cygwin"}
]
x-ci-accept-failures: [
"oraclelinux-7"
+1
packages/conf-python-3-7/conf-python-3-7.1.0.0/opam
···
["python37"] {os-distribution = "macports" & os = "macos"}
["python@3"] {os-distribution = "homebrew" & os = "macos"}
["system:python3"] {os-distribution = "cygwinports"}
+
["python3"] {os-distribution = "cygwin"}
]
x-ci-accept-failures: [
"opensuse-15.3" # python >=3.7 not packaged
+1
packages/conf-python-3/conf-python-3.1.0.0/opam
···
["python36"] {os-distribution = "macports" & os = "macos"}
["python@3"] {os-distribution = "homebrew" & os = "macos"}
["system:python3"] {os-distribution = "cygwinports"}
+
["python3"] {os-distribution = "cygwin"}
]
synopsis: "Virtual package relying on Python-3 installation"
description: """
+1
packages/conf-python-3/conf-python-3.9.0.0/opam
···
["python39"] {os-distribution = "macports" & os = "macos"} # this will not result in a python3 command but only a python3.9 command
["python@3.9"] {os-distribution = "homebrew" & os = "macos"}
["system:python3"] {os-distribution = "cygwinports"}
+
["python3"] {os-distribution = "cygwin"}
]
synopsis: "Virtual package relying on Python-3 installation"
description: """
+1
packages/conf-time/conf-time.1/opam
···
depends: ["conf-which" {build}]
depexts: [
["system:time"] {os = "win32" & os-distribution = "cygwinports"}
+
["time"] {os-distribution = "cygwin"}
["time"] {os-family = "debian"}
["time"] {os-family = "ubuntu"}
["time"] {os-distribution = "centos"}
+1
packages/conf-zig/conf-zig.1/opam
···
["zig"] {os = "freebsd"}
["zig"] {os = "macos" & os-distribution = "homebrew"}
["system:zig"] {os = "win32" & os-distribution = "cygwinports"}
+
["zig"] {os-distribution = "cygwin"}
]
synopsis: "Virtual package relying on zig"
description: