Enable Ogg Vorbis support by default

libvorbis is included in-tree so this doesn't require additional
dependencies.

.travis.yml

@@ -14,8 +14,8 @@ env:
     - CC=gcc
     - CC=clang
     # extra libs
-    - CC=gcc USE_CODEC_VORBIS=1 USE_FREETYPE=1
-    - CC=clang USE_CODEC_VORBIS=1 USE_FREETYPE=1
+    - CC=gcc USE_FREETYPE=1
+    - CC=clang USE_FREETYPE=1
     # cross-compile using mingw
     # dlopen curl to workaround link error because mingw-w64 in trusty is missing strtok_r required by libcurl.a
     - CC= PLATFORM="mingw32" ARCH="x86" USE_CURL_DLOPEN=1

Makefile

@@ -176,7 +176,7 @@ ifndef USE_CURL_DLOPEN
 endif
 
 ifndef USE_CODEC_VORBIS
-USE_CODEC_VORBIS=0
+USE_CODEC_VORBIS=1
 endif
 
 ifndef USE_CODEC_OPUS

jenkins-ci-build.sh

@@ -8,7 +8,6 @@ cd ${MASTER_DIR}
 
 if [ "${OPTIONS}" == "all_options" ];
 then
-	export USE_CODEC_VORBIS=1
 	export USE_FREETYPE=1
 fi