Don't override OPTFLAG to fix missing debug info and other flags

Due to us setting OPTFLAG we were overriding the flags we set via CFLAGS for projects using gnustep-make, which meant no -g or other flags we set.

Actually fixes #18.

Author: triplef

scripts/sdkenv.sh

@@ -75,13 +75,4 @@ case $BUILD_TYPE in
   Debug)
     GNUSTEP_MAKE_OPTIONS="$GNUSTEP_MAKE_OPTIONS debug=yes"
     ;;
-  RelWithDebInfo)
-    GNUSTEP_MAKE_OPTIONS="$GNUSTEP_MAKE_OPTIONS debug=yes OPTFLAG=-Os"
-    ;;
-  Release)
-    GNUSTEP_MAKE_OPTIONS="$GNUSTEP_MAKE_OPTIONS OPTFLAG=-Os"
-    ;;
-  *)
-    echo "Error: unknown build type \"$BUILD_TYPE\"."
-    exit 1
 esac