gnu: php: Update to 7.1.8.

* gnu/packages/patches/gd-CVE-2017-7890.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it
* gnu/packages/php.scm (php): Update to 7.1.8.

gnu/packages/php.scm

@@ -49,10 +49,21 @@
   #:use-module (guix build-system gnu)
   #:use-module ((guix licenses) #:prefix license:))
 
+(define gd-for-php
+  (package
+    (inherit gd)
+    (source (origin
+             (inherit (package-source gd))
+             (patches 
+               (append
+                 (origin-patches (package-source gd))
+                 (search-patches "gd-CVE-2017-7890.patch")))))))
+
+
 (define-public php
   (package
     (name "php")
-    (version "7.1.6")
+    (version "7.1.8")
     (home-page "https://secure.php.net/")
     (source (origin
               (method url-fetch)
@@ -60,7 +71,7 @@
                                   name "-" version ".tar.xz"))
               (sha256
                (base32
-                "0nr49gqhk4pv8kcdc60cl1mgwlinawpraq9ba15whzmb472lsn01"))
+                "1aramb6dm57pr2iz61id9vzfy7h5qkb6bf7dxhrwnjk0723qahw9"))
               (modules '((guix build utils)))
               (snippet
                '(with-directory-excursion "ext"
@@ -282,7 +293,7 @@
        ("curl" ,curl)
        ("cyrus-sasl" ,cyrus-sasl)
        ("freetype" ,freetype)
-       ("gd" ,gd)
+       ("gd" ,gd-for-php)
        ("gdbm" ,gdbm)
        ("glibc" ,glibc)
        ("gmp" ,gmp)