Properly support png 1.5

Obtained from:	pkgsrc


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@375470 35697150-7ecd-e111-bb59-0022644237b5
- Readd empty directories to plist

Pointyhat to:	bapt


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@375471 35697150-7ecd-e111-bb59-0022644237b5
Mk/bsd.linux-apps.mk: bump sdl_image shlib.

- Use correct shlib version for sdl_image 1.2.12

PR:		196251
Differential Revision:	https://reviews.freebsd.org/D1366
Submitted by:	amdmi3
Approved by:	swills (mentor)
Approved by:	portmgr (swills)


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@375472 35697150-7ecd-e111-bb59-0022644237b5
Use a less kludgy way for handling libperl.so's versionning and linking.

Sponsored by:	Absolight


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@375473 35697150-7ecd-e111-bb59-0022644237b5