package/libuhttpd: disable -Werror

Disable -Werror to fix the following build failure raised at least since
bump to version 3.9.0 in commit e76d9868c940f2d19968077b97e79c49376aa464
and
https://github.com/zhaojh329/libuhttpd/commit/81db1fa371bc80f40c1bfe60010e7d64bdf30b46:

/home/autobuild/autobuild/instance-8/output-1/build/libuhttpd-3.14.1/src/file.c: In function '__serve_file':
/home/autobuild/autobuild/instance-8/output-1/build/libuhttpd-3.14.1/src/file.c:322:50: error: format '%llu' expects argument of type 'long long unsigned int', but argument 4 has type '__off_t' {aka 'long int'} [-Werror=format=]
  322 |         conn->send_header(conn, "Content-Range", "bytes */%" PRIu64, st->st_size);
      |                                                  ^~~~~~~~~~~         ~~~~~~~~~~~
      |                                                                        |
      |                                                                        __off_t {aka long int}
In file included from /home/autobuild/autobuild/instance-8/output-1/build/libuhttpd-3.14.1/src/file.c:36:
/home/autobuild/autobuild/instance-8/output-1/per-package/libuhttpd/host/mips64el-buildroot-linux-uclibc/sysroot/usr/include/inttypes.h:91:41: note: format string is defined here
   91 | # define PRIu64         __PRI64_PREFIX "u"
cc1: all warnings being treated as errors

Fixes: e76d9868c940f2d19968077b97e79c49376aa464
 - http://autobuild.buildroot.org/results/46349a1409f9cff027b462456078284459e75511

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libuhttpd/0003-CMakeLists.txt-add-BUILD_WERROR-option.patch

@@ -0,0 +1,30 @@
+From c0f2260d8b7e435bce765e7ac91d51f1b349b87b Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Sun, 10 Mar 2024 13:43:12 +0100
+Subject: [PATCH] CMakeLists.txt: add BUILD_WERROR option
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Upstream: https://github.com/zhaojh329/libuhttpd/commit/c0f2260d8b7e435bce765e7ac91d51f1b349b87b
+---
+ CMakeLists.txt | 8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 6fb9651..6719e5f 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -7,7 +7,13 @@ include(CheckLibraryExists)
+ list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/Modules/")
+ 
+ add_definitions(-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64)
+-add_compile_options(-O -Wall -Werror --std=gnu99)
++add_compile_options(-O -Wall --std=gnu99)
++
++option(BUILD_WERROR "Build with -Werror" ON)
++
++if(BUILD_WERROR)
++    add_compile_options(-Werror)
++endif()
+ 
+ option(BUILD_STATIC "Build static library" OFF)
+ 

package/libuhttpd/libuhttpd.mk

@@ -10,6 +10,7 @@ LIBUHTTPD_LICENSE = MIT
 LIBUHTTPD_LICENSE_FILES = LICENSE
 LIBUHTTPD_INSTALL_STAGING = YES
 LIBUHTTPD_DEPENDENCIES = libev
+LIBUHTTPD_CONF_OPTS = -DBUILD_WERROR=OFF
 
 ifeq ($(BR2_PACKAGE_OPENSSL),y)
 LIBUHTTPD_DEPENDENCIES += openssl