Add a new warning message: conversion of %s return value from '%s' to '%s'.

Lint now warns when a function's return value is converted to a smaller
(or differently signed) type.  These conversions can happen when
doing an assignment, when passing a function's return value as an argument
to another function, or when initializing a variable.  Currently this
produces useless warnings on tolower() and toupper() because they return
ints but are usually assigned to chars.

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