Updated 3rdparty libsamplerate to version 0.1.7 and bumped requirement
to system's libsamplerate to version 0.1.7.
Besides minor stuff, version 0.1.7 has one important fix:
* src/src_sinc.c
Fix a segfault which occurs when memcpy is passed a bad length parameter.
This bug has zero security implications beyond the ability to cause a
program hitting this bug to exit immediately with a segfault.
(cherry picked from commit ca5588f747)
af8862fd2a