libFLAC: Ignore integer overflows in fixed.c

Bug: 154921875
Bug: 170736714
Bug: 170583772
Test: POC in bug descriptions
Merged-In: I55d55b3dee1e4d4fba52239ddbb3e721ab2d3dc6
Change-Id: Iae2c28e6b0d0b47ae92bdb65a7bf4095df65dc16
1 file changed