Build windows 64bit binary using UCRT64 (#2832)

* Build windows 64bit binary using UCRT64

Is the default and recommended msystem setting. Will produce
binaries that are compatible with windows 10 and later.

Also run tests for 32bit build.

Related to #2831

* Use jq -b in tests/shtest

* Add Windows strptime

* Make Windows-optional tests not run on Windows again

---------

Co-authored-by: Nicolas Williams <nico@cryptonector.com>

.github/workflows/ci.yml

@@ -196,19 +196,16 @@ jobs:
           - i386
         include:
           - arch: amd64
-            CC: x86_64-pc-msys
-            toolchain: gcc
-            msystem: msys
+            msystem: UCRT64
           - arch: i386
-            CC: i686-w64-mingw32
-            toolchain: mingw-w64-i686-toolchain
-            msystem: mingw32
+            msystem: MINGW32
     runs-on: windows-2022
     env:
-      CHOST: ${{ matrix.CC }}
-      CC: ${{ matrix.CC }}-gcc
       LDFLAGS: -s
       SUFFIX: windows-${{ matrix.arch }}
+    defaults:
+      run:
+        shell: msys2 {0}
     steps:
       - name: Clone repository
         uses: actions/checkout@v3
@@ -224,13 +221,12 @@ jobs:
             autoconf
             automake
             libtool
-            ${{ matrix.toolchain }}
+          pacboy: >-
+            toolchain:p
       - name: Build
-        shell: msys2 {0}
         run: |
           autoreconf -i
           ./configure \
-            --host=${{ matrix.CC }} \
             --disable-docs \
             --disable-valgrind \
             --with-oniguruma=builtin \
@@ -242,9 +238,6 @@ jobs:
           file ./jq.exe
           cp ./jq.exe jq-${{ env.SUFFIX }}.exe
       - name: Test
-        # Only run tests for amd64 matching the CI machine arch
-        if: ${{ matrix.arch == 'amd64' }}
-        shell: msys2 {0}
         run: |
           make check VERBOSE=yes
           git diff --exit-code --ignore-submodules