Fix cmake flag

Author: ChillerDragon

CMakeLists.txt

@@ -64,7 +64,7 @@ endif()
 # We assume that char is signed in various places in the code. In particular,
 # the Str.StrToInts test will fail when char is not signed and names containing
 # special characters will be displayed incorrectly on servers.
-add_compiler_flag_if_supported(OUR_FLAGS -fsigned-char)
+add_compiler_flag_if_supported(-fsigned-char)
 
 set(LINK_FLAGS_PLATFORM "")