Update a couple of syntax-highlighting files to allow "header" lines to handle cases where the executable is specified as /usr/bin/env <executable>

Original nano commit: 5095
http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=5095
Original nano commit message:
	Recognizing also header lines that use "/usr/bin/env" to call
	the program, instead of just a direct call via "/bin/program".
	Doing this for Shell scripts, and for Python, Perl and Ruby.
	This fixes Savannah bug #43270 reported by Kitty.