- Fix security problems

Note:
An integer overflow error within the "cff_charset_compute_cids()"
function in cff/cffload.c can be exploited to potentially cause
a heap-based buffer overflow via a specially crafted font.

Multiple integer overflow errors within validation functions in
sfnt/ttcmap.c can be exploited to bypass length validations and
potentially cause buffer overflows via specially crafted fonts.

An integer overflow error within the "ft_smooth_render_generic()"
function in smooth/ftsmooth.c can be exploited to potentially cause
a heap-based buffer overflow via a specially crafted font.

Approved by:	portmgr (pav)
Obtained from:	freetype git repo
Security:	http://www.vuxml.org/freebsd/20b4f284-2bfc-11de-bdeb-0030843d3802.html

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