gnu: zlib: Update to 1.2.12.

* gnu/packages/compression.scm (zlib): Update to 1.2.12.
[source](patches): New field.
[arguments]: Set CC variable.
* gnu/packages/commencement.scm (zlib-final)[source]: New field.
* gnu/packages/patches/zlib-cc.patch,
gnu/packages/patches/zlib-correct-crc32-inputs.patch: New files.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.

gnu/local.mk

@@ -1962,6 +1962,8 @@ dist_patch_DATA =						\
   %D%/packages/patches/xterm-370-explicit-xcursor.patch		\
   %D%/packages/patches/xygrib-fix-finding-data.patch		\
   %D%/packages/patches/yggdrasil-extra-config.patch	\
+  %D%/packages/patches/zlib-cc.patch				\
+  %D%/packages/patches/zlib-correct-crc32-inputs.patch		\
   %D%/packages/patches/zig-use-system-paths.patch
 
 MISC_DISTRO_FILES =				\

gnu/packages/commencement.scm

@@ -3013,6 +3013,7 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
   ;; Zlib used by GCC-FINAL.
   (package
     (inherit zlib)
+    (source (bootstrap-origin (package-source zlib)))
     (arguments
      `(#:guile ,%bootstrap-guile
        #:implicit-inputs? #f

gnu/packages/compression.scm

@@ -100,7 +100,7 @@
 (define-public zlib
   (package
     (name "zlib")
-    (version "1.2.11")
+    (version "1.2.12")
     (source
      (origin
       (method url-fetch)
@@ -108,9 +108,11 @@
                                  version ".tar.gz")
                  (string-append "mirror://sourceforge/libpng/zlib/"
                                 version "/zlib-" version ".tar.gz")))
+      (patches (search-patches "zlib-cc.patch"
+                               "zlib-correct-crc32-inputs.patch"))
       (sha256
        (base32
-        "18dighcs333gsvajvvgqp8l4cx7h1x7yx9gd5xacnk80spyykrf3"))))
+        "1n9na4fq4wagw1nzsfjr6wyly960jfa94460ncbf6p1fac44i14i"))))
     (build-system gnu-build-system)
     (outputs '("out" "static"))
     (arguments
@@ -122,6 +124,7 @@
              ;; extra flags like `--enable-fast-install', so we need to
              ;; invoke it with just what it understand.
              (let ((out (assoc-ref outputs "out")))
+               (setenv "CC" ,(cc-for-target))
                ;; 'configure' doesn't understand '--host'.
                ,@(if (%current-target-system)
                      `((setenv "CHOST" ,(%current-target-system)))

gnu/packages/patches/zlib-cc.patch

@@ -0,0 +1,21 @@
+Fix configure issue that discarded provided CC definition.
+
+Taken from upstream:
+
+  https://github.com/madler/zlib/commit/05796d3d8d5546cf1b4dfe2cd72ab746afae505d
+
+diff --git a/configure b/configure
+index 52ff4a04e..3fa3e8618 100755
+--- a/configure
++++ b/configure
+@@ -174,7 +174,10 @@ if test -z "$CC"; then
+   else
+     cc=${CROSS_PREFIX}cc
+   fi
++else
++  cc=${CC}
+ fi
++
+ cflags=${CFLAGS-"-O3"}
+ # to force the asm version use: CFLAGS="-O3 -DASMV" ./configure
+ case "$cc" in

gnu/packages/patches/zlib-correct-crc32-inputs.patch

@@ -0,0 +1,44 @@
+Correct incorrect inputs provided to the CRC functions.
+
+Taken from upstream:
+
+  https://github.com/madler/zlib/commit/ec3df00224d4b396e2ac6586ab5d25f673caa4c2
+
+diff --git a/crc32.c b/crc32.c
+index a1bdce5c2..451887bc7 100644
+--- a/crc32.c
++++ b/crc32.c
+@@ -630,7 +630,7 @@ unsigned long ZEXPORT crc32_z(crc, buf, len)
+ #endif /* DYNAMIC_CRC_TABLE */
+ 
+     /* Pre-condition the CRC */
+-    crc ^= 0xffffffff;
++    crc = (~crc) & 0xffffffff;
+ 
+     /* Compute the CRC up to a word boundary. */
+     while (len && ((z_size_t)buf & 7) != 0) {
+@@ -749,7 +749,7 @@ unsigned long ZEXPORT crc32_z(crc, buf, len)
+ #endif /* DYNAMIC_CRC_TABLE */
+ 
+     /* Pre-condition the CRC */
+-    crc ^= 0xffffffff;
++    crc = (~crc) & 0xffffffff;
+ 
+ #ifdef W
+ 
+@@ -1077,7 +1077,7 @@ uLong ZEXPORT crc32_combine64(crc1, crc2, len2)
+ #ifdef DYNAMIC_CRC_TABLE
+     once(&made, make_crc_table);
+ #endif /* DYNAMIC_CRC_TABLE */
+-    return multmodp(x2nmodp(len2, 3), crc1) ^ crc2;
++    return multmodp(x2nmodp(len2, 3), crc1) ^ (crc2 & 0xffffffff);
+ }
+ 
+ /* ========================================================================= */
+@@ -1112,5 +1112,5 @@ uLong crc32_combine_op(crc1, crc2, op)
+     uLong crc2;
+     uLong op;
+ {
+-    return multmodp(op, crc1) ^ crc2;
++    return multmodp(op, crc1) ^ (crc2 & 0xffffffff);
+ }