testing appveyor mingw64 7.3

.appveyor.yml

@@ -27,11 +27,11 @@ install:
 build_script:
   - git submodule update --init --recursive
   # MinGW files need to be at the beginning of the PATH
-  - set PATH=C:\msys64\usr\bin;%PATH%
+  - set PATH=C:\mingw-w64\x86_64-7.3.0-posix-seh-rt_v5-rev0\usr\bin;%PATH%
   # Workaround for CMake not wanting sh.exe on PATH for MinGW
-  - rm "C:\msys64\usr\bin\sh.exe"
+  - rm "C:\mingw-w64\x86_64-7.3.0-posix-seh-rt_v5-rev0\usr\bin\sh.exe"
   - rm "C:\Program Files\Git\usr\bin\sh.exe"
   - cmake -E make_directory build
-  - cmake -E chdir build cmake -DCMAKE_PREFIX_PATH=C:\mingw64 -D ACADOS_WITH_QPOASES=ON -D BLASFEO_TARGET=GENERIC -D HPIPM_TARGET=GENERIC -D BUILD_SHARED_LIBS=OFF -D ACADOS_EXAMPLES=ON -D ACADOS_UNIT_TESTS=ON -DEIGEN3_INCLUDE_DIR="C:\dev\Eigen3\include\eigen3" -G "MinGW Makefiles" ..
+  - cmake -E chdir build cmake -DCMAKE_PREFIX_PATH=C:\mingw-w64\x86_64-7.3.0-posix-seh-rt_v5-rev0 -D ACADOS_WITH_QPOASES=ON -D BLASFEO_TARGET=GENERIC -D HPIPM_TARGET=GENERIC -D BUILD_SHARED_LIBS=OFF -D ACADOS_EXAMPLES=ON -D ACADOS_UNIT_TESTS=ON -DEIGEN3_INCLUDE_DIR="C:\dev\Eigen3\include\eigen3" -G "MinGW Makefiles" ..
   - cmake --build build --config Release
   - cmake -E chdir build ctest -V