php: security bump to version 7.1.7

php: security bump to version 7.1.7

Fixes the following security issues:

CVE-2017-7890 - Buffer over-read into uninitialized memory.  The GIF
decoding function gdImageCreateFromGifCtx in gd_gif_in.c (which can be
reached with a call to the imagecreatefromstring() function) uses
constant-sized color tables of size 3 * 256, but does not zero-out these
arrays before use.

CVE-2017-9224, CVE-2017-9226, CVE-2017-9227, CVE-2017-9228, CVE-2017-9229 -
Out-of-bonds access in oniguruma regexp library.

CVE-2017-11144 - In PHP before 5.6.31, 7.x before 7.0.21, and 7.1.x before
7.1.7, the openssl extension PEM sealing code did not check the return value
of the OpenSSL sealing function, which could lead to a crash of the PHP
interpreter, related to an interpretation conflict for a negative number in
ext/openssl/openssl.c, and an OpenSSL documentation omission.

CVE-2017-11145 - In PHP before 5.6.31, 7.x before 7.0.21, and 7.1.x before
7.1.7, lack of a bounds check in the date extension's timelib_meridian
parsing code could be used by attackers able to supply date strings to leak
information from the interpreter, related to an ext/date/lib/parse_date.c
out-of-bounds read affecting the php_parse_date function.

CVE-2017-11146 - In PHP through 5.6.31, 7.x through 7.0.21, and 7.1.x
through 7.1.7, lack of bounds checks in the date extension's
timelib_meridian parsing code could be used by attackers able to supply date
strings to leak information from the interpreter, related to
ext/date/lib/parse_date.c out-of-bounds reads affecting the php_parse_date
function.  NOTE: this vulnerability exists because of an incomplete fix for
CVE-2017-11145.

While we're at it, add a hash for the license file.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>