Configure: skins2 flags simplifications

configure.ac

@@ -3683,24 +3683,24 @@ AS_IF([test "${enable_skins2}" != "no"], [
 
   dnl Win32
   AS_IF([test "${SYS}" = "mingw32"], [
-    VLC_ADD_CPPFLAGS([skins2],[-U_OFF_T_ -U_off_t -Imodules/gui/skins2 -DWIN32_SKINS])
-    VLC_ADD_CXXFLAGS([skins2],[-O2 -fno-rtti])
+    VLC_ADD_CPPFLAGS([skins2],[-U_OFF_T_ -U_off_t -DWIN32_SKINS])
     VLC_ADD_LIBS([skins2],[-lgdi32 -lole32 -luuid -lmsimg32])
   dnl MacOS
   ], [test "${SYS}" = "darwin"], [
-    VLC_ADD_CPPFLAGS([skins2],[-Imodules/gui/skins2 -DMACOSX_SKINS])
-    VLC_ADD_CXXFLAGS([skins2],[-O2 -fno-rtti])
+    VLC_ADD_CPPFLAGS([skins2],[ -DMACOSX_SKINS])
     VLC_ADD_LIBS([skins2],[-Wl,-framework,Carbon])
   dnl Linux/Unix
   ], [
     PKG_CHECK_MODULES([XPM], [xpm],, [have_skins_deps="no"])
     PKG_CHECK_MODULES([XINERAMA], [xinerama],, [have_skins_deps="no"])
     PKG_CHECK_MODULES([XEXT], [xext],, [have_skins_deps="no"])
-    VLC_ADD_CPPFLAGS([skins2],[-Imodules/gui/skins2 ${X_CFLAGS} ${XEXT_CFLAGS} ${XPM_CFLAGS} -DX11_SKINS])
-    VLC_ADD_CXXFLAGS([skins2],[-O2 -fno-rtti])
+    VLC_ADD_CPPFLAGS([skins2],[${X_CFLAGS} ${XEXT_CFLAGS} ${XPM_CFLAGS} -DX11_SKINS])
     VLC_ADD_LIBS([skins2],[${X_LIBS} ${X_PRE_LIBS} ${XEXT_LIBS} ${XPM_LIBS} ${XINERAMA_LIBS} -lX11])
   ])
 
+  dnl for All OSes
+  VLC_ADD_CXXFLAGS([skins2],[-O2 -fno-rtti])
+
   dnl we need freetype
   AS_IF([test "${have_freetype}" != "yes"], [
     have_skins_deps="no"