Move wxMac and wxiOS builds to Mac CI workflow

Still run them on GitHub runners, but do it using the same steps as for
our own builds, as there should be no reason to have any difference
in the build steps independently of where exactly they run.

Also remove checks for matrix.skip_testing from the Unix CI workflow as
they are not needed there any more because the tests are always run.

This commit is best viewed with --color-moved git option.

.github/workflows/ci_mac.yml

@@ -65,7 +65,7 @@ jobs:
       run:
         shell: /usr/bin/arch -arch ${{ matrix.arch }} /bin/bash -l {0}
 
-    runs-on: self-hosted
+    runs-on: ${{ matrix.runner }}
 
     name: ${{ matrix.name }}
 
@@ -73,16 +73,31 @@ jobs:
       fail-fast: false
       matrix:
         include:
-        - name: ARM C++11
+        - name: wxMac ARM C++11
+          runner: self-hosted
           arch: arm64
           configure_flags: --with-cxx=11
           use_asan: true
-        - name: Intel C++17
+        - name: wxMac Intel C++17
+          runner: self-hosted
           arch: x86_64
           configure_flags: --with-cxx=17 --with-macosx-version-min=10.12 --enable-debug
-        - name: Universal C++14
+        - name: wxMac Universal C++14
+          runner: self-hosted
           arch: arm64
           configure_flags: --with-cxx=14 --enable-universal_binary=arm64,x86_64 --disable-shared --disable-debug --enable-optimise
+        - name: wxMac macOS 10.15
+          runner: macos-10.15
+          arch: x86_64
+          configure_flags: --disable-sys-libs
+        - name: wxiOS
+          runner: macos-10.15
+          arch: x86_64
+          configure_flags: --with-osx_iphone --enable-monolithic  --disable-sys-libs --host=i686-apple-darwin_sim --build=x86_64-apple-darwin17.7.0
+          xcode_sdk: iphonesimulator
+          skip_samples: true
+          skip_testing: true
+          allow_warnings: true
 
     env:
       wxCONFIGURE_FLAGS: --disable-sys-libs --without-liblzma ${{ matrix.configure_flags }} --prefix=${{ github.workspace }}/localbin_${{ matrix.arch }}
@@ -137,6 +152,12 @@ jobs:
     - name: Configuring
       run: |
         wxCONFIGURE_OPTIONS="--disable-optimise $wxCONFIGURE_FLAGS"
+
+        if [ -n "${{ matrix.xcode_sdk }}" ]; then
+          sdk_path=`xcrun --sdk ${{ matrix.xcode_sdk }} --show-sdk-path`
+          wxCONFIGURE_OPTIONS="--with-macosx-sdk=$sdk_path $wxCONFIGURE_OPTIONS"
+        fi
+
         ./configure $wxCONFIGURE_OPTIONS --disable-debug_info || rc=$?
         if [ ${{ matrix.use_asan }} ]; then
           wxASAN_CFLAGS="-fsanitize=address -fno-omit-frame-pointer"