Added script for disabling compiler flags.

DisableCompilerFlag.cmake

+# DisableCompilerFlag.cmake
+#
+# 2012-05-14 Lars Bilke
+#
+# Removes the given FLAG from the compiler flags in the given CONFIGURATION.
+# The Configuration must be uppercased.
+#
+# Usage:
+# 
+#   include(DisableCompilerFlag)
+#   if (MSVC)
+#     DisableCompilerFlag(DEBUG /RTC1)
+#   endif ()
+
+macro(DisableCompilerFlag CONFIGURATION FLAG)
+	if(CMAKE_CXX_FLAGS_${CONFIGURATION} MATCHES "${FLAG}")
+		string(REPLACE "${FLAG}" " " CMAKE_CXX_FLAGS_${CONFIGURATION} "${CMAKE_CXX_FLAGS_${CONFIGURATION}}")
+		# message(STATUS ${PROJECT_NAME}  " CMAKE_CXX_FLAGS_${CONFIGURATION} removing ${FLAG}")
+	endif()
+endmacro()
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