gopher: fix build for GCC 14

The project's configure file tested if the C compiler worked by
compiling a small program, but that test program does not compile on GCC
14. This commit adds a patch which makes that test program work with GCC
14

Author: langsjo

pkgs/by-name/go/gopher/int_main.patch

@@ -0,0 +1,13 @@
+diff --git a/configure b/configure
+index 1b20711..79ce215 100644
+--- a/configure
++++ b/configure
+@@ -679,7 +679,7 @@ cat > conftest.$ac_ext << EOF
+ #line 680 "configure"
+ #include "confdefs.h"
+ 
+-main(){return(0);}
++int main(){return(0);}
+ EOF
+ if { (eval echo configure:685: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+   ac_cv_prog_cc_works=yes

pkgs/by-name/go/gopher/package.nix

@@ -18,6 +18,10 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ ncurses ];
 
+  patches = [
+    ./int_main.patch # https://github.com/jgoerzen/gopher/pull/8
+  ];
+
   preConfigure = "export LIBS=-lncurses";
 
   meta = with lib; {