Define SLAP_STRTOL macro for integerBitAndMatch() and integerBitOrMatch()

usage - necessary to use larger types for interop with a certain client
that would expect the assertion (attr:1.2.840.113556.1.4.803:=2147483648)
to match a signed value (eg. -2147483646).

There are probably better / more portable solutions; review appreciated.