Add gcc build to appveyor (#5654)

* Add gcc build to appveyor
As tea-ci has been broken for quite a while now there has been no MINGW CI available. MINGW builds can be done in appveyor too. Tools build had to be disabled as it takes longer than the allowed 60 minutes. Wa,-mbig-obj was added to avoid "file too big" errors.

* Align appveyor gcc build configuration with travis
This will hopefully make the build fast enough not to miss the 60 minute maximum build time

* Turns out non-debug build needs -mbig-obj too

.appveyor.yml

@@ -8,6 +8,20 @@ image:
 shallow_clone: true
 clone_depth: 1
 
+environment:
+  matrix:
+    - BUILD: GCC
+    - BUILD: MSVC
+
+matrix:
+  exclude:
+    - image: Visual Studio 2017 Preview
+      BUILD: GCC
+    - image: Visual Studio 2019 Preview
+      BUILD: GCC
+    - image: Previous Visual Studio 2017
+      BUILD: GCC
+
 install:
   - set "PATH=C:\msys64\usr\bin;C:\msys64\mingw64\bin;C:\Windows\System32;C:\Windows;%PATH%"
   - set MSYSTEM=MINGW64
@@ -17,6 +31,19 @@ build_script:
   - bash -lc "exec 0</dev/null && cd $APPVEYOR_BUILD_FOLDER && make SUBTARGET=tiny PTR64=1 TOOLS=1 OPTIMIZE=0 vs2017 -j4"
   - msbuild "build\projects\windows\mametiny\vs2017\mametiny.sln" /m /p:ContinueOnError=false /p:StopOnFirstFailure=true /property:Configuration=Debug /property:Platform=x64 /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
 
+for:
+  -
+    matrix:
+      only:
+        - BUILD: GCC
+    build_script:
+      - bash -lc "exec 0</dev/null && cd $APPVEYOR_BUILD_FOLDER && export MINGW64=/mingw64 && make SUBTARGET=tiny PTR64=1 OPTIMIZE=0 ARCHOPTS=-Wa,-mbig-obj IGNORE_GIT=1 -j4"
+    test_script:
+      - \projects\mame\mametiny64.exe -validate
+    after_test:
+      - 7z a mametiny64-appveyor-%APPVEYOR_REPO_BRANCH%-%APPVEYOR_REPO_COMMIT%-%APPVEYOR_BUILD_NUMBER%.7z %APPVEYOR_BUILD_FOLDER%\*.exe %APPVEYOR_BUILD_FOLDER%\artwork %APPVEYOR_BUILD_FOLDER%\bgfx %APPVEYOR_BUILD_FOLDER%\ctrlr %APPVEYOR_BUILD_FOLDER%\docs %APPVEYOR_BUILD_FOLDER%\hash %APPVEYOR_BUILD_FOLDER%\hlsl %APPVEYOR_BUILD_FOLDER%\ini %APPVEYOR_BUILD_FOLDER%\language %APPVEYOR_BUILD_FOLDER%\nl_examples %APPVEYOR_BUILD_FOLDER%\plugins %APPVEYOR_BUILD_FOLDER%\roms %APPVEYOR_BUILD_FOLDER%\samples
+      - appveyor PushArtifact mametiny64-appveyor-%APPVEYOR_REPO_BRANCH%-%APPVEYOR_REPO_COMMIT%-%APPVEYOR_BUILD_NUMBER%.7z
+
 test_script:
   - \projects\mame\mametiny64d.exe -validate