pkgconfig/osmocodec/osmocoding: link to talloc

find . -maxdepth 1 -iname "libosmo*so" | xargs -n1 -I\# sh -c "echo \#
&& nm \# | grep 'U talloc'"
tells us that all libs depend on talloc, but pkgconfig omits it for
codec and coding, which sometimes leads to linking issues with libtool
and
lld.

Change-Id: I75a4d39a0c3d53fc4c311e25e933a22832616cea
diff --git a/libosmocoding.pc.in b/libosmocoding.pc.in
index 580b170..d1d03c4 100644
--- a/libosmocoding.pc.in
+++ b/libosmocoding.pc.in
@@ -6,6 +6,6 @@
 Name: Osmocom L1 transcoding Library
 Description: C Utility Library
 Version: @VERSION@
-Libs: -L${libdir} -losmocoding -losmocodec -losmogsm -losmocore
-Cflags: -I${includedir}/
+Libs: -L${libdir} @TALLOC_LIBS@ -losmocoding -losmocodec -losmogsm -losmocore
+Cflags: -I${includedir}/ @TALLOC_CFLAGS@