GHA: install MSYS2 Perl manually for latest GitHub runners

As the MSYS2 update propagates into more GitHub runner images, we need
to install Perl to avoid native Windows (aka Strawberry) Perl breaking
jobs that are running tests.

For others jobs, this patch leaves the new default Strawberry Perl. It's
fine to use it a little bit more.

Also:
- libssh 32-bit was dropped upstream, replace with libssh2, and move
  libssh to the 64-bit job running tests.
  f6ae36581d
  https://github.com/msys2/MINGW-packages/pull/30777

Refs:
https://github.com/actions/runner-images/issues/14562
https://github.com/actions/runner-images/pull/14541#issuecomment-5294304716
636489312c
https://github.com/msys2/MSYS2-packages/pull/6491
https://github.com/msys2/MSYS2-packages/pull/6479

Bug: https://github.com/curl/curl/pull/22537#issuecomment-5359154818
Follow-up to d854ab4673 #22580

Closes #22632

.github/workflows/distcheck.yml

@@ -278,7 +278,7 @@ jobs:
           cache: false
           path-type: inherit
           install: >-
-            mingw-w64-x86_64-zlib mingw-w64-x86_64-zstd mingw-w64-x86_64-libpsl mingw-w64-x86_64-libssh2 mingw-w64-x86_64-nghttp2 mingw-w64-x86_64-openssl
+            perl mingw-w64-x86_64-zlib mingw-w64-x86_64-zstd mingw-w64-x86_64-libpsl mingw-w64-x86_64-libssh2 mingw-w64-x86_64-nghttp2 mingw-w64-x86_64-openssl
 
       - name: 'install prereqs'
         timeout-minutes: 3

.github/workflows/windows.yml

@@ -604,7 +604,8 @@ jobs:
             ver: '16.1.0'
             url: 'https://github.com/skeeto/w64devkit/releases/download/v2.8.0/w64devkit-x64-2.8.0.7z.exe'
             SHA256: 6252bf34fe2231a55ac7f03d482b36d2c7c58697990551bba508102cfb3f342e
-            config: '-DENABLE_DEBUG=ON -DBUILD_SHARED_LIBS=OFF -DCURL_USE_SCHANNEL=ON -DENABLE_UNICODE=OFF -DENABLE_UNIX_SOCKETS=OFF -DCURL_GCC_ANALYZER=ON -DCMAKE_C_FLAGS=-DCURL_DEBUG_NO_WIN32_WND'
+            config: '-DENABLE_DEBUG=ON -DBUILD_SHARED_LIBS=OFF -DCURL_USE_SCHANNEL=ON -DCURL_USE_LIBSSH=ON -DENABLE_UNICODE=OFF -DENABLE_UNIX_SOCKETS=OFF -DCURL_GCC_ANALYZER=ON -DCMAKE_C_FLAGS=-DCURL_DEBUG_NO_WIN32_WND'
+            install: perl mingw-w64-x86_64-libssh
             type: 'Debug'
           - name: 'schannel'  # mingw-w64 10.0
             sys: 'mingw64'
@@ -634,8 +635,8 @@ jobs:
             ver: '6.4.0'
             url: 'https://downloads.sourceforge.net/mingw-w64/Toolchains%20targetting%20Win32/Personal%20Builds/mingw-builds/6.4.0/threads-win32/dwarf/i686-6.4.0-release-win32-dwarf-rt_v5-rev0.7z'
             SHA256: 12d2c62ad4527ec8a52275ea8485678dcbe20bec4716a3c7ba274f225d696085
-            config: '-DCURL_USE_SCHANNEL=ON -DCURL_USE_LIBSSH=ON -DENABLE_UNICODE=OFF -DCMAKE_UNITY_BUILD=OFF -DCURL_TARGET_WINDOWS_VERSION=0x0600'
-            install: mingw-w64-i686-libssh
+            config: '-DCURL_USE_SCHANNEL=ON -DENABLE_UNICODE=OFF -DCMAKE_UNITY_BUILD=OFF -DCURL_TARGET_WINDOWS_VERSION=0x0600'
+            install: perl mingw-w64-i686-libssh2
             type: 'Debug'
             tflags: 'skiprun'
           - name: 'schannel !examples'  # mingw-w64 3.0