Portability fix: use the value of `INT_MAX` from `<limits.h>` to determine
the appropriate constants for the FNV hash algorithm.

Suggested by:	Alan Barrett


git-svn-id: https://elftoolchain.svn.sourceforge.net/svnroot/elftoolchain/trunk@2870 95820547-d848-0410-985e-9ae8fe0fa350