bitlbee-mastodon: fix gcc-15 build

Without the change the build fails on `master` as
https://hydra.nixos.org/build/319885265:

    mastodon-lib.c:2096:28: error: 'bool' cannot be used here
     2096 | static char *yes_or_no(int bool)
          |                            ^~~~

pkgs/by-name/bi/bitlbee-mastodon/gcc-15.patch

@@ -0,0 +1,17 @@
+https://github.com/kensanata/bitlbee-mastodon/pull/61
+
+FIx gcc-15 build (`bool` collision).
+--- a/src/mastodon-lib.c
++++ b/src/mastodon-lib.c
+@@ -2093,9 +2093,9 @@ static char *indent(int n)
+ /**
+  * Return a static yes or no string. No deallocation needed.
+  */
+-static char *yes_or_no(int bool)
++static char *yes_or_no(int b)
+ {
+-	return bool ? "yes" : "no";
++	return b ? "yes" : "no";
+ }
+ 
+ /**

pkgs/by-name/bi/bitlbee-mastodon/package.nix

@@ -17,6 +17,11 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-8vmq/YstuBYUxe00P4NrxD/eMYI++R9uvn1sCcMTr7I=";
   };
 
+  patches = [
+    # gcc-15 build fix: https://github.com/kensanata/bitlbee-mastodon/pull/61
+    ./gcc-15.patch
+  ];
+
   nativeBuildInputs = [
     autoreconfHook
     pkg-config