gnu: http-parser: Fix build [and guix pull] on armhf-linux.

* gnu/packages/web.scm (http-parser)[source]: Add patch.
* gnu/packages/patches/http-parser-fix-assertion-on-armhf.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -1081,6 +1081,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/hdf-eos5-remove-gctp.patch		\
   %D%/packages/patches/hdf-eos5-fix-szip.patch			\
   %D%/packages/patches/hdf-eos5-fortrantests.patch		\
+  %D%/packages/patches/http-parser-fix-assertion-on-armhf.patch	\
   %D%/packages/patches/hubbub-sort-entities.patch		\
   %D%/packages/patches/hurd-cross.patch				\
   %D%/packages/patches/hplip-remove-imageprocessor.patch	\

gnu/packages/patches/http-parser-fix-assertion-on-armhf.patch

@@ -0,0 +1,39 @@
+From: Tobias Geerinckx-Rice <me@tobias.gr>
+Date: Wed, 20 May 2020 19:17:13 +0200
+Subject: [PATCH] gnu: http-client: Fix assertion on armhf-linux.
+
+Copied verbatim from [0] to fix guix pull[1] on ARM systems.
+
+[0]: https://github.com/nodejs/http-parser/pull/510
+[1]: https://issues.guix.gnu.org/40604
+
+From 0e5868aebb9eb92b078d27bb2774c2154dc167e2 Mon Sep 17 00:00:00 2001
+From: Ben Noordhuis <info@bnoordhuis.nl>
+Date: Thu, 30 Apr 2020 11:22:50 +0200
+Subject: [PATCH] Fix sizeof(http_parser) assert
+
+The result should be 32 on both 32 bits and 64 bits architectures
+because of struct padding.
+
+Fixes: https://github.com/nodejs/http-parser/issues/507
+---
+ test.c | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/test.c b/test.c
+index 7983424..f60a84f 100644
+--- a/test.c
++++ b/test.c
+@@ -4220,8 +4220,11 @@ main (void)
+   patch = version & 255;
+   printf("http_parser v%u.%u.%u (0x%06lx)\n", major, minor, patch, version);
+ 
++  /* Should be 32 on both 32 bits and 64 bits architectures because of
++   * struct padding, see https://github.com/nodejs/http-parser/issues/507.
++   */
+   printf("sizeof(http_parser) = %u\n", (unsigned int)sizeof(http_parser));
+-  assert(sizeof(http_parser) == 4 + 4 + 8 + 2 + 2 + 4 + sizeof(void *));
++  assert(sizeof(http_parser) == 32);
+ 
+   //// API
+   test_preserve_data();

gnu/packages/web.scm

@@ -5917,24 +5917,26 @@ into your tests.  It automatically starts up a HTTP server in a separate thread
               (method git-fetch)
               (uri (git-reference (url home-page)
                                   (commit (string-append "v" version))))
-              (file-name (git-file-name name version))
-              (patches
-               ;; When parsing URLs, treat an empty port (eg
-               ;; `http://hostname:/`) as if it were unspecified.  This patch is
-               ;; applied to Fedora's http-parser and to libgit2's bundled version.
-               (list
-                (origin
-                  (method url-fetch)
-                  (uri (string-append
-                         "https://src.fedoraproject.org/rpms/http-parser/raw/"
-                         "e89b4c4e2874c19079a5a1a2d2ccc61b551aa289/"
-                         "f/0001-url-treat-empty-port-as-default.patch"))
-                  (sha256
-                   (base32
-                    "0pbxf2nq9pcn299k2b2ls8ldghaqln9glnp79gi57mamx4iy0f6g")))))
               (sha256
                (base32
-                "1vda4dp75pjf5fcph73sy0ifm3xrssrmf927qd1x8g3q46z0cv6c"))))
+                "1vda4dp75pjf5fcph73sy0ifm3xrssrmf927qd1x8g3q46z0cv6c"))
+              (file-name (git-file-name name version))
+              (patches
+               (cons*
+                (origin
+                  ;; Treat an empty port (e.g. `http://hostname:/`) when parsing
+                  ;; URLs as if no port were specified.  This patch is applied
+                  ;; to Fedora's http-parser and to libgit2's bundled version.
+                  (method url-fetch)
+                  (uri (string-append
+                        "https://src.fedoraproject.org/rpms/http-parser/raw/"
+                        "e89b4c4e2874c19079a5a1a2d2ccc61b551aa289/"
+                        "f/0001-url-treat-empty-port-as-default.patch"))
+                  (sha256
+                   (base32
+                    "0pbxf2nq9pcn299k2b2ls8ldghaqln9glnp79gi57mamx4iy0f6g")))
+                ;; A fix for <https://issues.guix.gnu.org/40604>.
+                (search-patches "http-parser-fix-assertion-on-armhf.patch")))))
     (build-system gnu-build-system)
     (arguments
      `(#:test-target "test"