www/apache24: fix CVEs, update 2.4.12 -> 2.4.16

• Convet to USES=autoreconf
• Sort USES
• Remove now empty patch files

Security: https://vuxml.freebsd.org/freebsd/a12494c1-2af4-11e5-86ff-14dae9d210b8.html
Differential Revision: https://reviews.freebsd.org/D3101

Submitted by: feld
Reviewed by: pgollucci (myself)
With Hat: apache@
MFH: 2015Q3