Build and portability fixes:
* Makefile: honour CMDLINE_CFLAGS, CMDLINE_CPPFLAGS, CMDLINE_LDFLAGS.
+ * debian/rules: use dpkg-buildflags and pass to Makefile.
* xbatmon-simple: Saner build rune.
* cprogs/Makefile: clean deletes $PROGRAMS
* random-word: Some perl-mode emacs formatting glitch workarounds.