libosmo{gb,vty}.pc.in: Add talloc to 'Requires'

Both libraries use talloc symbols so they should require it,
see https://gerrit.osmocom.org/c/libosmocore/+/27521/1/libosmogb.pc.in#9

In subsequent patches, we should move all of those to Requires.private,
but I wanted to fix it step by step.

Change-Id: I755275ce4f4148b5beffaa28a6a0ce2dd0e2d6b4

libosmogb.pc.in

@@ -6,6 +6,6 @@ includedir=@includedir@
 Name: Osmocom GPRS Gb Library
 Description: Osmocom GPRS Gb Interface (NS/BSSGP) Library
 Version: @VERSION@
-Requires: libosmocore, libosmovty
+Requires: talloc, libosmocore, libosmovty
 Libs: -L${libdir} -losmogb
 Cflags: -I${includedir}/ -fno-strict-aliasing

libosmovty.pc.in

@@ -6,6 +6,6 @@ includedir=@includedir@
 Name: Osmocom VTY Interface Library
 Description: C Utility Library
 Version: @VERSION@
-Requires: libosmocore
+Requires: talloc, libosmocore
 Libs: -L${libdir} -losmovty
 Cflags: -I${includedir}/