contrib: update to the latest libebml/libmatroska packages

extras/contrib/src/Patches/libebml.patch

-Index: libebml/src/EbmlFloat.cpp
-===================================================================
---- libebml/src/EbmlFloat.cpp	(revision 1099)
-+++ libebml/src/EbmlFloat.cpp	(revision 1101)
-@@ -102,8 +102,8 @@
- 		if (Size == 4) {
- 			big_int32 TmpRead;
- 			TmpRead.Eval(Buffer);
--			float val = *((float *)&(int32(TmpRead)));
--			Value = val;
-+			int32 tmpp = int32(TmpRead);
-+			Value = *((float *) &tmpp);
- 			bValueIsSet = true;
- 		} else if (Size == 8) {
- 			big_int64 TmpRead;

extras/contrib/src/packages.mak

@@ -71,9 +71,9 @@ FAAC_VERSION=1.24
 FAAC_URL=$(VIDEOLAN)/testing/contrib/faac-$(FAAC_VERSION).tar.bz2
 LAME_VERSION=3.93.1
 LAME_URL=$(SF)/lame/lame-$(LAME_VERSION).tar.gz
-LIBEBML_VERSION=0.7.3
+LIBEBML_VERSION=0.7.4
 LIBEBML_URL=http://dl.matroska.org/downloads/libebml/libebml-$(LIBEBML_VERSION).tar.bz2
-LIBMATROSKA_VERSION=0.7.5
+LIBMATROSKA_VERSION=0.7.6
 LIBMATROSKA_URL=http://dl.matroska.org/downloads/libmatroska/libmatroska-$(LIBMATROSKA_VERSION).tar.bz2
 FFMPEG_VERSION=0.4.8
 FFMPEG_URL=$(SF)/ffmpeg/ffmpeg-$(FFMPEG_VERSION).tar.gz