contrib: prepend extras/tools/build/bin to PATH

This makes sure our build of tar (if it exists) is used before system tar

contrib/src/main.mak

@@ -13,6 +13,9 @@ TOPDST ?= ..
 SRC := $(TOPSRC)/src
 TARBALLS := $(TOPSRC)/tarballs
 
+PATH :=$(abspath ../../extras/tools/build/bin):$(PATH)
+export PATH
+
 PKGS_ALL := $(patsubst $(SRC)/%/rules.mak,%,$(wildcard $(SRC)/*/rules.mak))
 DATE := $(shell date +%Y%m%d)
 VPATH := $(TARBALLS)