Ports: Update build flags for ScummVM

These were no longer being picked up after some recent changes. Since
port builds happen in subshells nowadays, we can get rid of the export /
unset combo anyway.

This fixes ScummVM crashing on startup, caused by `-fvisibility` not
being set.

Author: gmta

Ports/scummvm/package.sh

@@ -15,19 +15,10 @@ launcher_category=Games
 launcher_command=/usr/local/bin/scummvm
 icon_file=icons/scummvm.ico
 
-function pre_configure() {
-    export CPPFLAGS="-fvisibility=hidden"
-    export FREETYPE2_CFLAGS="-I${SERENITY_INSTALL_ROOT}/usr/local/include/freetype2"
-    export OPENGL_CFLAGS="-I${SERENITY_INSTALL_ROOT}/usr/include/LibGL"
-    export SDL_CFLAGS="-I${SERENITY_INSTALL_ROOT}/usr/local/include/SDL2"
-}
-
-function post_configure() {
-    unset CPPFLAGS
-    unset FREETYPE2_CFLAGS
-    unset OPENGL_CFLAGS
-    unset SDL_CFLAGS
-}
+export CPPFLAGS="-fvisibility=hidden"
+export FREETYPE2_CFLAGS="-I${SERENITY_INSTALL_ROOT}/usr/local/include/freetype2"
+export OPENGL_CFLAGS="-I${SERENITY_INSTALL_ROOT}/usr/include/LibGL"
+export SDL_CFLAGS="-I${SERENITY_INSTALL_ROOT}/usr/local/include/SDL2"
 
 function post_install() {
     icons_build_dir="${PORT_BUILD_DIR}/scummvm-icons"