Trying to compile with GCC14 will fail on compiler sanity check with:
configure:1056:1: error: return type defaults to 'int' [-Wimplicit-int]
 1056 | main(){return(0);}
      | ^~~~

This is due to GCC14 not allowing implicit integer types anymore[1].

So, patch configure to avoid this and make it compile with GCC14.

[1] https://gcc.gnu.org/gcc-14/porting_to.html#implicit-int

Signed-off-by: Robert Marko <robimarko@gmail.com>
--- a/configure
+++ b/configure
@@ -1053,7 +1053,7 @@ cat > conftest.$ac_ext << EOF
 #line 1054 "configure"
 #include "confdefs.h"
 
-main(){return(0);}
+int main(){return(0);}
 EOF
 if { (eval echo configure:1059: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   ac_cv_prog_cc_works=yes
