build.sh: allow to use cmake option directly

It is handy to test option barely used. New options could be added to the script but there are alredy too much of them.

build.sh

@@ -43,6 +43,7 @@ for ARG in "$@"; do
         --wx30        ) flags+=(-DWX28_API=FALSE) ;;
         --64-bit-dont-work ) flags+=(-D64BIT_BUILD_DONT_WORK=TRUE) ;;
         --no-simd     ) flags+=(-DDISABLE_ADVANCE_SIMD=TRUE) ;;
+        -D*           ) flags+=($ARG) ;;
 
         *)
             # Unknown option