www/angie: Update to 1.3.1

• remove @sample marker from html; these files are not supposed to be modified by the end user
• obey CFLAGS/LDFLAGS and add USES=localbase. This allows dependent modules to add necessary compiler/linker hints.

Changelog: https://github.com/webserver-llc/angie/blob/master/CHANGES

PR: 274728