contrib: add pcre rules

Change-Id: Iab1ec2ef7d880127e36296058ccf20b551c79389
Refs: #46617

contrib/src/pcre/SHA512SUMS

+e94c652b40de60b391e28afbddc67b5a034650f6f62027e52f2d7aef53caf5f0da9f2d4f6872d1558f965dd9d4d696e5e23d2a50f20a4fbc9f0a707fb6f55fae  pcre-8.35.tar.bz2

contrib/src/pcre/rules.mak

+# Perl Compatible Regular Expression
+
+PCRE_VERSION := 8.35
+PCRE_URL := ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-$(PCRE_VERSION).tar.bz2
+
+PKGS += pcre
+ifeq ($(call need_pkg," >= 8.33"),)
+PKGS_FOUND += pcre
+endif
+
+$(TARBALLS)/pcre-$(PCRE_VERSION).tar.bz2:
+	$(call download,$(PCRE_URL))
+
+.sum-pcre: pcre-$(PCRE_VERSION).tar.bz2
+
+pcre: pcre-$(PCRE_VERSION).tar.bz2 .sum-pcre
+	$(UNPACK)
+	$(MOVE)
+
+.pcre: pcre
+	cd $< && $(HOSTVARS) ./configure $(HOSTCONF)
+	cd $< && $(MAKE) install
+	touch $@