Fix the build with automake 1.13
Fix the build with automake 1.13

In Automake 1.13, the long-deprecated macro AM_CONFIG_HEADER (deprecated
since 2002) has been removed in favour of AC_CONFIG_HEADERS.

freedesktop-unofficial-mirror/telepathy__telepathy-farstream,freedesktop-unofficial-mirror/telepathy__telepathy-farstream,freedesktop-unofficial-mirror/telepathy__telepathy-farstream