Change gcc warning file name, remove unnecessary reference

Author: ljedrz

src/bootstrap/dist.rs

@@ -310,8 +310,8 @@ fn make_win_dist(
 
     // Warn windows-gnu users that the bundled GCC cannot compile C files
     builder.create(
-        &target_bin_dir.join("DO NOT USE THIS gcc.exe FOR COMPILATION.txt"),
-        &"gcc.exe contained in this folder cannot be used for compiling C files - it is only\
+        &target_bin_dir.join("GCC-WARNING.txt"),
+        "gcc.exe contained in this folder cannot be used for compiling C files - it is only\
          used as a linker. In order to be able to compile projects containing C code use\
          the GCC provided by MinGW or Cygwin."
     );