Fix #151: Compile error in SDL2Parser.cpp (still)

Compiler flags are specified via COMPILE_FLAGS and not via COMPILE_OPTIONS.

Author: ceeac

src/boomerang/ssl/parser/CMakeLists.txt

@@ -53,7 +53,7 @@ if (CMAKE_COMPILER_IS_GNUCXX AND BISON_VERSION VERSION_LESS 3.0.5)
     # Grammars generated by Bison 3.0.4 and below emit a null pointer dereference warning
     # when compiled with GCC 7
     set_source_files_properties(${CMAKE_CURRENT_SOURCE_DIR}/SSL2Parser.cpp
-        PROPERTIES COMPILE_OPTIONS -Wno-error=null-dereference)
+        PROPERTIES COMPILE_FLAGS -Wno-error=null-dereference)
 endif ()
 
 target_link_libraries(boomerang-ssl2-parser Qt5::Core)