contrib: use pkg-static on all pkg-config files

Use pkg-static to convert all generated .pc files.

That is because every contrib package is statically built,
however when the libring library is built,
pkg-config is not called with the --static flag.

It's done by adding an additional target in main.mak.
pkg-static can be safely run multiple times on the same file.

Change-Id: I2e5c47e793ed5516dd3c8aa0446077bfc945adcb

contrib/src/main.mak

@@ -393,9 +393,11 @@ PKGS_MANUAL := $(sort $(PKGS_ENABLE) $(filter-out $(PKGS_DISABLE),$(PKGS_AUTOMAT
 PKGS_DEPS := $(filter-out $(PKGS_FOUND) $(PKGS_MANUAL),$(sort $(foreach p,$(PKGS_MANUAL),$(DEPS_$(p)))))
 PKGS := $(sort $(PKGS_MANUAL) $(PKGS_DEPS))
 
+convert-static:
+	for p in $(PREFIX)/lib/pkgconfig/*.pc; do $(SRC)/pkg-static.sh $$p; done
 fetch: $(PKGS:%=.sum-%)
 fetch-all: $(PKGS_ALL:%=.sum-%)
-install: $(PKGS:%=.%)
+install: $(PKGS:%=.%) convert-static
 
 mostlyclean:
 	-$(RM) $(foreach p,$(PKGS_ALL),.$(p) .sum-$(p) .dep-$(p))