Contribs: add gpg-error

contrib/src/gpg-error/SHA512SUMS

+6cf5138e05fb6ee320035d86c71ff9aa940b0f16e4787eb832a781d5d97d0e865eac0b988c251657a0e77dffced1d9ef3e7f4d0cdf806cb18abfbbcf07f27a72  libgpg-error-1.7.tar.bz2

contrib/src/gpg-error/rules.mak

+# GPGERROR
+GPGERROR_VERSION := 1.7
+GPGERROR_URL := ftp://ftp.gnupg.org/gcrypt/libgpg-error/libgpg-error-$(GPGERROR_VERSION).tar.bz2
+
+PKGS += gpg-error
+
+$(TARBALLS)/libgpg-error-$(GPGERROR_VERSION).tar.bz2:
+	$(call download,$(GPGERROR_URL))
+
+.sum-gpg-error: libgpg-error-$(GPGERROR_VERSION).tar.bz2
+
+libgpg-error: libgpg-error-$(GPGERROR_VERSION).tar.bz2 .sum-gpg-error
+	$(UNPACK)
+	$(MOVE)
+
+.gpg-error: libgpg-error
+	#$(RECONF)
+	cd $< && $(HOSTVARS) ./configure $(HOSTCONF) --disable-nls --disable-shared --disable-languages
+	cd $< && $(MAKE) install
+	touch $@