opensonic: don't overwrite CMAKE_BUILD_TYPE

srcpkgs/opensonic/patches/fix-cflags.patch

@@ -0,0 +1,17 @@
+Index: CMakeLists.txt
+===================================================================
+--- CMakeLists.txt.orig
++++ CMakeLists.txt
+@@ -25,12 +25,10 @@ SET(GAME_NAME "Open Sonic")
+ SET(GAME_VERSION "0.1.4")
+ SET(RTFM "Please read the user manual (readme.html) to get help.")
+ SET(ALLEGRO_RECOMMENDED_VERSION "4.4.1")
+-SET(CMAKE_BUILD_TYPE Release)
+ MESSAGE("${GAME_NAME} version ${GAME_VERSION}")
+ 
+ # configuring...
+ SET(DEFS "")
+-SET(CFLAGS_EXTRA "-g")
+ SET(CFLAGS "${CFLAGS} ${CMAKE_C_FLAGS}")
+ MESSAGE("Using CFLAGS='${CFLAGS}'")
+