100l: Remove stray character that slipped into header name.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@17231 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -1013,7 +1013,7 @@ mpeg2video_encoder_select="aandct"
 mpeg4_encoder_select="aandct"
 mpeg_vdpau_decoder_deps="vdpau"
 mpeg1_vdpau_decoder_deps="vdpau"
-mpeg_xvmc_decoder_deps="X11_extensions_XvMClibx_h"
+mpeg_xvmc_decoder_deps="X11_extensions_XvMClib_h"
 msmpeg4v1_encoder_select="aandct"
 msmpeg4v2_encoder_select="aandct"
 msmpeg4v3_encoder_select="aandct"