Remove /* foo.c */ comments

This was done by the following
        find . -name '*.[ch]' | /tmp/pl
where /tmp/pl is the following three-line script:
        print unless $. == 1 && m@/\* .*\.[ch] \*/@;
        close ARGV if eof; # Close file to reset $.

And then some hand-editing of other files.

Reviewed-by: Viktor Dukhovni <viktor@openssl.org>

demos/engines/ibmca/hw_ibmca.c

@@ -1,4 +1,3 @@
-/* crypto/engine/hw_ibmca.c */
 /*
  * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project
  * 2000.