Disable static analyzer warning for google-runtime-int.

User code is doing the right thing by passing "long" when
that is what fseek expects.

This is the warning that will be disabled:

file_wrapper_input.cpp:63:24: warning: consider replacing 'long' with 'int64' [google-runtime-int]

Bug: 28220065
Test: verified warning is not emitted anymore.
Change-Id: I8dbaf8be481f8e10575e6e45d7d0977d04a17461