devel/raylib: Install missing header files

The header files:

• raymath.h
• rlgl.h
• physac.h

were missing from the installation and pkg-plist.

Also, while here, cleanup some style nits and bump PORTREVISION.

PR: 251819
Submitted by: Martin Filla <freebsd@sysctl.cz> (maintainer)
Reported by: Mattias Wikstrom <burke@yagrebu.net>
Reviewed by: osa (mentor)
Approved by: osa (mentor)
Differential Revision: https://reviews.freebsd.org/D27776