[platform] msvc.cmake: Disable some more warnings that are causing errors now.

Disabled these warnings:
- C4005: macro redefinition (libpng's intprefix.out.tf1 is breaking on this...)
- C4091: 'typedef ': ignored on left of 'tagGPFIDL_FLAGS' when no variable is declared
- C4800: 'BOOL': forcing value to bool 'true' or 'false' (performance warning)

TODO:
- Re-enable C4800 as not-an-error?
- Figure out how to fix libpng's C4005 warnings.

cmake/platform/msvc.cmake

@@ -10,7 +10,10 @@ ENDIF(NOT CMAKE_SYSTEM_VERSION)
 
 # Disable useless warnings:
 # - MSVC "logo" messages
+# - C4005: macro redefinition (libpng's intprefix.out.tf1 is breaking on this...)
+# - C4091: 'typedef ': ignored on left of 'tagGPFIDL_FLAGS' when no variable is declared
 # - C4355: 'this' used in base member initializer list (used for Qt Dpointer pattern)
+# - C4800: 'BOOL': forcing value to bool 'true' or 'false' (performance warning)
 # - MSVCRT "deprecated" functions
 # - std::tr1 deprecation
 # Increase some warnings to errors:
@@ -19,7 +22,7 @@ ENDIF(NOT CMAKE_SYSTEM_VERSION)
 # - C4024: 'function': different types for formal and actual parameter n
 # - C4047: 'function': 'parameter' differs in levels of indirection from 'argument'
 # - C4477: 'function' : format string 'string' requires an argument of type 'type', but variadic argument number has type 'type'
-SET(RP_C_FLAGS_COMMON "/nologo /W3 /WX /wd4355 /we4013 /we4024 /we4047 /we4477")
+SET(RP_C_FLAGS_COMMON "/nologo /W3 /WX /wd4005 /wd4091 /wd4355 /wd4800 /we4013 /we4024 /we4047 /we4477")
 SET(RP_CXX_FLAGS_COMMON "${RP_C_FLAGS_COMMON} -D_SILENCE_TR1_NAMESPACE_DEPRECATION_WARNING")
 ADD_DEFINITIONS(-D_CRT_SECURE_NO_WARNINGS -D_CRT_SECURE_NO_DEPRECATE -D_CRT_NONSTDC_NO_DEPRECATE -D_SCL_SECURE_NO_WARNINGS)
 # NOTE: /TSAWARE is automatically set for Windows 2000 and later. (as of at least Visual Studio .NET 2003)