abuild: fix detection of pkg-config module version

pkg-config will not print version unless dependencies are met so we can
not exclude the system modules.

abuild.in

@@ -909,7 +909,7 @@ prepare_pkgconfig_provides() {
 		fi
 		local f=${i##*/}
 		local v=$(PKG_CONFIG_PATH="$dir"/usr/lib/pkgconfig pkg-config \
-			--env-only --modversion ${f%.pc})
+			--modversion ${f%.pc})
 		echo "${f%.pc}=${v:-0}" >> "$controldir"/.provides-pc
 	done
 }