[fix environment cleanups in regress test
John Meacham <john@repetae.net>**20100708103450
 Ignore-this: 2f8a4af5ee19161faec3577537c1a68d
] hunk ./regress/regress.prl 47
-delete $ENV{JHCPATH};
-delete $ENV{JHCOPTS};
+delete $ENV{JHC_PATH};
+delete $ENV{JHC_OPTS};
+delete $ENV{JHC_CACHE};
+delete $ENV{JHC_LIBRARY_PATH};