Rename 2013/endoh4/run.sh to try.sh + formatting

I believe that this completes the review of 2013.

2013/endoh4/README.md

@@ -65,11 +65,13 @@ This simple spec involves many details.
 
 (Note that this program does not use `math.h`.)
 
+
 ### Portability
 
 I think it conforms with both C89 and C99.  I confirmed that it worked on gcc,
 clang, and tcc.  It should not be warned with `-pedantic` and `-Wextra`.
 
+
 ### Tips
 
 You may want to use `tput` to hide the terminal cursor.

2013/endoh4/try.sh

@@ -1,6 +1,19 @@
 #!/usr/bin/env bash
+#
+# try.sh - demonstrate IOCCC winner 2013/endoh4
+#
 
-make all || exit 1
+# make sure CC is set so that when we do make CC="$CC" it isn't empty. Doing it
+# this way allows us to have the user specify a different compiler in an easy
+# way.
+if [[ -z "$CC" ]]; then
+    CC="cc"
+fi
+
+make CC="$CC" all >/dev/null || exit 1
+
+# clear screen after compilation so that only the entry is shown
+clear
 
 # set it so that when program is terminated through various signals we re-enable
 # the cursor