Rename 1992/runme.sh lush.sh and improve it

The script now lets one specify which compiler to use so that one can
(in the case that their cc is clang, for instance like it is with macOS)
specify a path to a real gcc compiler.

thanks-for-help.md

@@ -1568,13 +1568,13 @@ it moves towards the right but if you click the mouse it goes back.
 [Yusuke](#yusuke) supplied a patch which makes this work with gcc. Due to how it works (see
 Judges' remarks in the README.md file) this will not work with clang.
 
-[Cody](#cody) also provided the `runme.sh` script to demonstrate it as using make was
-problematic.
+[Cody](#cody) also provided the [lush.sh](/1992/lush/lush.sh) script to
+demonstrate it as using make was problematic.
 
 Cody made it use `fgets()` instead of `gets()`.
 
-NOTE: this entry cannot work with clang due to different compiler messages. See
-[bugs.md](/bugs.md) for details.
+NOTE: this entry cannot work with clang due to different compiler messages (it
+will compile fine but it won't work). See [bugs.md](/bugs.md) for details.
 
 
 ## <a name="1992_marangon"></a>[1992/marangon](/1992/marangon/marangon.c) ([README.md](/1992/marangon/README.md))