Make sure everybody wraps #include "config.h" in #ifdef HAVE_CONFIG_H

Make sure everybody wraps #include "config.h" in #ifdef HAVE_CONFIG_H

Original commit message from CVS:
* ext/ffmpeg/gstffmpeg.c:
* ext/ffmpeg/gstffmpegcodecmap.c:
* ext/ffmpeg/gstffmpegdec.c:
* ext/ffmpeg/gstffmpegenc.c:
* ext/ffmpeg/gstffmpegprotocol.c:
* ext/gdk_pixbuf/gstgdkanimation.c:
* ext/jpeg/gstjpeg.c:
* ext/libpng/gstpng.c:
* ext/mpeg2dec/perftest.c:
* ext/speex/gstspeex.c:
* gst-libs/gst/resample/dtos.c:
* gst/intfloat/gstintfloatconvert.c:
* gst/oneton/gstoneton.c:
* gst/rtjpeg/RTjpeg.c:
* gst/rtp/gstrtp.c:
* sys/dxr3/dxr3init.c:
* sys/glsink/gstgl_nvimage.c:
* sys/glsink/gstgl_pdrimage.c:
* sys/glsink/gstglsink.c:
* testsuite/gst-lint:
Make sure everybody wraps #include "config.h" in #ifdef HAVE_CONFIG_H