Fix up the directofile generation for SDL2

src/syncterm/GNUmakefile

@@ -112,9 +112,9 @@ ifeq ($(os),darwin)
 	${QUIET}${INSTALL_EXE} ${SYNCTERM} ${EXEODIR}/SyncTERM.app/Contents/MacOS
 	${QUIET}${INSTALL_DATA} Info.plist ${EXEODIR}/SyncTERM.app/Contents
 	${QUIET}${INSTALL_DATA} SyncTERM.icns ${EXEODIR}/SyncTERM.app/Contents/Resources
-	-${QUIET}rm -rf ${EXEODIR}/SyncTERM.app/Contents/Frameworks/SDL.framework
-	${QUIET}cp -R ${SDL_FRAMEWORK_PATH}/SDL.framework ${EXEODIR}/SyncTERM.app/Contents/Frameworks
-	${QUIET}rm -rf ${EXEODIR}/SyncTERM.app/Contents/Frameworks/SDL.framework/Headers/*
+	-${QUIET}rm -rf ${EXEODIR}/SyncTERM.app/Contents/Frameworks/SDL2.framework
+	${QUIET}cp -R ${SDL_FRAMEWORK_PATH}/SDL2.framework ${EXEODIR}/SyncTERM.app/Contents/Frameworks
+	${QUIET}rm -rf ${EXEODIR}/SyncTERM.app/Contents/Frameworks/SDL2.framework/Headers/*
 endif
 
 syncterm.man: syncterm.man.in