Add "-D_GNU_SOURCE" to DFB_INTERNAL_CFLAGS instead of CPPFLAGS to have it exported via directfb-internal.pc making external modules much more convenient.
Add "-D_GNU_SOURCE" to DFB_INTERNAL_CFLAGS instead of CPPFLAGS
to have it exported via directfb-internal.pc making external modules
much more convenient.

sklnet/DirectFB,kevleyski/DirectFB-1,kevleyski/directfb,dfbdok/DirectFB1,sklnet/DirectFB,kaostao/directfb,Distrotech/DirectFB,lancebaiyouview/DirectFB,jcdubois/DirectFB,kevleyski/DirectFB-1,sklnet/DirectFB,deniskropp/DirectFB,jcdubois/DirectFB,deniskropp/DirectFB,Distrotech/DirectFB,lancebaiyouview/DirectFB,deniskropp/DirectFB,mtsekm/test,djbclark/directfb-core-DirectFB,DirectFB/directfb,Distrotech/DirectFB,DirectFB/directfb,sklnet/DirectFB,djbclark/directfb-core-DirectFB,mtsekm/test,kevleyski/directfb,deniskropp/DirectFB,jcdubois/DirectFB,djbclark/directfb-core-DirectFB,dfbdok/DirectFB1,kevleyski/directfb,kevleyski/DirectFB-1,kaostao/directfb,kevleyski/directfb,kaostao/directfb,lancebaiyouview/DirectFB,djbclark/directfb-core-DirectFB,DirectFB/directfb,kevleyski/DirectFB-1,dfbdok/DirectFB1,mtsekm/test,lancebaiyouview/DirectFB