devel/pcre: Add patch to resolve heap overflow vulnerability

Obtained from:	http://vcs.pcre.org/pcre?view=revision&revision=1594
Security:	6900e6f1-4a79-11e5-9ad8-14dae9d210b8

devel/pcre/Makefile

@@ -3,7 +3,7 @@
 
 PORTNAME=	pcre
 PORTVERSION=	8.37
-PORTREVISION=	3
+PORTREVISION=	4
 CATEGORIES=	devel
 MASTER_SITES=	SF/${PORTNAME}/${PORTNAME}/${PORTVERSION} \
 		ftp://ftp.csx.cam.ac.uk/pub/software/programming/${PORTNAME}/ \

devel/pcre/files/patch-r1594-heap-overflow

@@ -0,0 +1,20 @@
+--- pcre_compile.c	2015/08/14 09:34:32	1593
++++ pcre_compile.c	2015/08/21 16:08:33	1594
+@@ -7238,7 +7238,7 @@
+           encountered. In that case, we allow yet more memory, just in case. 
+           (Again, this is fixed "properly" in PCRE2. */
+           
+-          if (cd->dupgroups) *lengthptr += 2 + 2*LINK_SIZE;
++          if (cd->dupgroups) *lengthptr += 4 + 4*LINK_SIZE;
+ 
+           /* Otherwise, check for recursion here. The name table does not exist
+           in the first pass; instead we must scan the list of names encountered
+@@ -9474,7 +9474,7 @@
+ "const" attribute if the cast (pcre_uchar *)codestart is used directly in the
+ function call. */
+ 
+-if ((options & PCRE_NO_AUTO_POSSESS) == 0)
++if (errorcode == 0 && (options & PCRE_NO_AUTO_POSSESS) == 0)
+   {
+   pcre_uchar *temp = (pcre_uchar *)codestart;
+   auto_possessify(temp, utf, cd);