gnu: perl-www-curl: Fix build with curl@7.69.1.

* gnu/packages/web.scm (perl-www-curl)[source]:
Add perl-www-curl-fix-struct-void.patch.
* gnu/packages/patches/perl-www-curl-remove-symbol.patch: Update.
* gnu/packages/patches/perl-www-curl-fix-struct-void.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -1450,6 +1450,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/perl-text-markdown-discount-unbundle.patch	\
   %D%/packages/patches/perl-module-pluggable-search.patch	\
   %D%/packages/patches/perl-reproducible-build-date.patch	\
+  %D%/packages/patches/perl-www-curl-fix-struct-void.patch	\
   %D%/packages/patches/perl-www-curl-remove-symbol.patch	\
   %D%/packages/patches/picard-fix-id3-rename-test.patch		\
   %D%/packages/patches/picprog-non-intel-support.patch		\

gnu/packages/patches/perl-www-curl-fix-struct-void.patch

@@ -0,0 +1,24 @@
+From: Tobias Geerinckx-Rice <me@tobias.gr>
+Date: Sat, 14 Nov 2020 15:40:56 +0100
+Subject: [PATCH] gnu: perl-www-curl: Fix struct void* usage.
+
+Copied verbatim from Gentoo[0].  Fixes:
+
+  Curl.xs:76:12: error: expected ‘{’ before ‘void’
+       struct void *curlm;
+              ^~~~
+  Curl.xs:76:12: error: two or more data types in declaration specifiers
+
+[0]: https://694466.bugs.gentoo.org/attachment.cgi?id=595098
+
+--- WWW-Curl-4.17/Curl.xs	2014-02-21 18:08:30.000000000 +0200
++++ WWW-Curl-4.17.new/Curl.xs	2019-11-05 21:44:55.434395739 +0200
+@@ -73,7 +73,7 @@ typedef struct {
+ #ifdef __CURL_MULTI_H
+     struct CURLM *curlm;
+ #else
+-    struct void *curlm;
++    void *curlm;
+ #endif
+ } perl_curl_multi;
+ 

gnu/packages/web.scm

@@ -4423,14 +4423,14 @@ RFC 6570.")
               (uri (string-append
                     "mirror://cpan/authors/id/S/SZ/SZBALINT/WWW-Curl-"
                     version".tar.gz"))
-              (patches (search-patches "perl-www-curl-remove-symbol.patch"))
+              (patches (search-patches "perl-www-curl-fix-struct-void.patch"
+                                       "perl-www-curl-remove-symbol.patch"))
               (sha256
                (base32
                 "1fmp9aib1kaps9vhs4dwxn7b15kgnlz9f714bxvqsd1j1q8spzsj"))))
     (build-system perl-build-system)
     (arguments
      '(#:tests? #f                          ;XXX: tests require network access
-
        #:phases (modify-phases %standard-phases
                    (add-before 'configure 'set-search-path
                      (lambda _