Removed overwrite of CMAKE_C_FLAGS_DEBUG.

- No overwriting allows control from cmake cache or cmdline
- -g is already the CMake default
- -O0 is already gcc's default

CMakeLists.txt

@@ -99,7 +99,6 @@ IF (MSVC)
 
 ELSE ()
 	SET(CMAKE_C_FLAGS "-D_GNU_SOURCE -Wall -Wextra -Wno-missing-field-initializers -Wstrict-aliasing=2 -Wstrict-prototypes -Wmissing-prototypes ${CMAKE_C_FLAGS}")
-	SET(CMAKE_C_FLAGS_DEBUG "-O0 -g")
 	IF (MINGW) # MinGW always does PIC and complains if we tell it to
 		STRING(REGEX REPLACE "-fPIC" "" CMAKE_SHARED_LIBRARY_C_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS}")
 	ELSE ()