7zip: Disable Werror

Clang-21 finds more warnings, its a constant fight, lets disable
warning as errors and let upstream handle it

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-extended/7zip/7zip_25.01.bb

@@ -9,19 +9,13 @@ LIC_FILES_CHKSUM = "file://DOC/copying.txt;md5=4fbd65380cdd255951079008b364516c
 CVE_PRODUCT = "7-zip 7zip"
 SRC_URI = "git://github.com/ip7z/7zip.git;protocol=https;branch=main \
            file://0001-support-yocto-cross-compiling.patch \
+           file://0001-Remove-treating-warning-as-errors.patch \
            file://7z_wrapper.sh \
            "
 SRCREV = "5e96a8279489832924056b1fa82f29d5837c9469"
 
 UPSTREAM_CHECK_URI = "https://github.com/ip7z/7zip/releases/latest"
 
-
-# Support Yocto cross compiling
-CXXFLAGS:append:toolchain-clang = " -Wno-error=cast-qual -Wno-error=sign-conversion \
-                                    -Wno-error=disabled-macro-expansion \
-                                    -Wno-error=shorten-64-to-32 \
-                                    -Wno-error=cast-function-type-strict"
-
 EXTRA_OEMAKE += " \
     CXXFLAGS_EXTRA='${CXXFLAGS}' \
     CFLAGS_BASE2='${CFLAGS}' \

meta-oe/recipes-extended/7zip/files/0001-Remove-treating-warning-as-errors.patch

@@ -0,0 +1,31 @@
+From 4d12624e7d6f09d07816d3d0007465c8533af192 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Fri, 29 Aug 2025 15:29:13 -0700
+Subject: [PATCH] Remove treating warning as errors
+
+clang finds additional warnings with new versions e.g.
+Clang 21 added a new warning, -Wimplicit-void-ptr-cast
+(grouped under -Wc++-compat), which fires whenever a
+void* is implicitly converted to another pointer
+type (or returned as such).
+
+Upstream-Status: Inappropriate [Distro-specific]
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ CPP/7zip/7zip_gcc.mak | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/CPP/7zip/7zip_gcc.mak b/CPP/7zip/7zip_gcc.mak
+index 2722c93..b7db06a 100644
+--- a/CPP/7zip/7zip_gcc.mak
++++ b/CPP/7zip/7zip_gcc.mak
+@@ -24,7 +24,7 @@ PROGPATH_STATIC = $(O)/$(PROG)s
+ 
+ 
+ ifneq ($(CC), xlc)
+-CFLAGS_WARN_WALL = -Werror -Wall -Wextra
++CFLAGS_WARN_WALL = -Wall -Wextra
+ endif
+ 
+ # for object file