Contribs: add regex (necessary for Win32 libcddb)

contrib/src/regex/SHA512SUMS

+85a4f5161759646b3cf5484539cebe92e51ee1896f7853084d4aba2b5399164922103dc2b49971eca9821bec56195fef999f100f61b6d734955ccd7c81ca3ca7  regex-0.12.tar.gz

contrib/src/regex/rules.mak

+# REGEX
+REGEX_VERSION := 0.12
+REGEX_URL := http://ftp.gnu.org/old-gnu/regex/regex-$(REGEX_VERSION).tar.gz
+
+PKGS_FOUND += regex
+
+$(TARBALLS)/regex-$(REGEX_VERSION).tar.gz:
+	$(call download,$(REGEX_URL))
+
+.sum-regex: regex-$(REGEX_VERSION).tar.gz
+
+regex: regex-$(REGEX_VERSION).tar.gz .sum-regex
+	$(UNPACK)
+	$(MOVE)
+
+.regex: regex
+	cd $< && $(HOSTVARS) ./configure $(HOSTCONF)
+	cd $< && make subirs=
+	cd $< && $(AR) rcvu libregex.a regex.o && $(RANLIB) libregex.a && cp -v regex.h $(PREFIX)/include && cp -v libregex.a $(PREFIX)/lib
+	touch $@