db{48,53,60,62}: get gentoo patch for gcc15 and Wno-error=incompatible-pointer-types (#466885)

pkgs/development/libraries/db/db-4.8.nix

@@ -1,6 +1,7 @@
 {
   lib,
   stdenv,
+  fetchpatch,
   fetchurl,
   autoreconfHook,
   ...

pkgs/development/libraries/db/db-5.3.nix

@@ -1,6 +1,7 @@
 {
   lib,
   stdenv,
+  fetchpatch,
   fetchurl,
   autoreconfHook,
   ...

pkgs/development/libraries/db/db-6.0.nix

@@ -1,6 +1,7 @@
 {
   lib,
   stdenv,
+  fetchpatch,
   fetchurl,
   autoreconfHook,
   ...

pkgs/development/libraries/db/db-6.2.nix

@@ -1,6 +1,7 @@
 {
   lib,
   stdenv,
+  fetchpatch,
   fetchurl,
   autoreconfHook,
   ...

pkgs/development/libraries/db/generic.nix

@@ -1,6 +1,7 @@
 {
   lib,
   stdenv,
+  fetchpatch,
   fetchurl,
   autoreconfHook,
   cxxSupport ? true,
@@ -29,7 +30,14 @@ stdenv.mkDerivation (
     # configure checks to work incorrectly with clang 16.
     nativeBuildInputs = [ autoreconfHook ];
 
-    patches = extraPatches;
+    patches = [
+      (fetchpatch {
+        name = "gcc15.patch";
+        url = "https://gitweb.gentoo.org/repo/gentoo.git/plain/sys-libs/db/files/db-4.8.30-tls-configure.patch?id=1ae36006c79ef705252f5f7009e79f6add7dc353";
+        hash = "sha256-OzQL+kgXtcvhvyleDLuH1abhY4Shb/9IXx4ZkeFbHOA=";
+      })
+    ]
+    ++ extraPatches;
 
     outputs = [
       "bin"
@@ -75,6 +83,10 @@ stdenv.mkDerivation (
       popd
     '';
 
+    NIX_CFLAGS_COMPILE = [
+      "-Wno-error=incompatible-pointer-types"
+    ];
+
     configureFlags = [
       (if cxxSupport then "--enable-cxx" else "--disable-cxx")
       (if compat185 then "--enable-compat185" else "--disable-compat185")