libopus: updated to 1.1

Looks like a major update, with better performances for ARM.
diff --git a/jni/libopus/sources/opus-uninstalled.pc.in b/jni/libopus/sources/opus-uninstalled.pc.in
index 36e8db6..3f2d674 100644
--- a/jni/libopus/sources/opus-uninstalled.pc.in
+++ b/jni/libopus/sources/opus-uninstalled.pc.in
@@ -8,5 +8,5 @@
 Version: @VERSION@
 Requires:
 Conflicts:
-Libs: ${libdir}/libopus.a @PC_LIBM@
+Libs: ${libdir}/libopus.a @LIBM@
 Cflags: -I${pcfiledir}/@top_srcdir@/include