clang/lld will try to use the given -L/usr/lib + 32bit files and potentially
fail the the test on 64bit, carries on but leads to ogg underlinking.

Quickfix, ideally this should use pkg-config and hard-fail if not found.

https://bugs.gentoo.org/740794
--- a/m4/ogg.m4
+++ b/m4/ogg.m4
@@ -24,8 +24,4 @@
 fi
 
-XIPH_GCC_WARNING([-I$ogg_prefix/include],,
-    [ OGG_CFLAGS="-I$ogg_prefix/include"
-      OGG_LDFLAGS="-L$ogg_prefix/lib"
-      ])
 AC_CACHE_CHECK([for libogg], xt_cv_lib_ogg,
 [dnl