cmake: don't build with sanitizers using MinGW on Windows

(cherry picked from commit eeece1a)

Author: lmichaelis

CMakeLists.txt

@@ -20,8 +20,8 @@ else ()
     # enable all warnings
     set(PHOENIX_CXX_FLAGS -Wall -Wextra -Werror -Wconversion)
 
-    # in debug mode, enable sanitizers
-    if (${CMAKE_BUILD_TYPE} MATCHES "Debug" AND NOT ${PHOENIX_DISABLE_SANITIZERS})
+    # in debug mode, enable sanitizers; note: MinGW does not seem to understand sanitizers on Windows
+    if (${CMAKE_BUILD_TYPE} MATCHES "Debug" AND NOT ${PHOENIX_DISABLE_SANITIZERS} AND NOT WIN32)
         set(PHOENIX_CXX_FLAGS ${PHOENIX_CXX_FLAGS} -fsanitize=address -fsanitize=undefined)
 
         # when not compiling for MacOS, enable leak sanitizer