gitweb: fix warnings in PATH_INFO code and add export_ok/strict_export
gitweb: fix warnings in PATH_INFO code and add export_ok/strict_export

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git