build: fix build with automake 1.13
build: fix build with automake 1.13

AM_CONFIG_HEADER -> AC_CONFIG_HEADERS

https://bugzilla.gnome.org/show_bug.cgi?id=693373

Distrotech/gst-plugins-good,Distrotech/gst-plugins-good,Distrotech/gst-plugins-good,Distrotech/gst-plugins-good,Distrotech/gst-plugins-good