[Patch] Fix some main() return types

[Marko Lindqvist]

 What is your policy about compiler warnings from successfully
completing autoconf tests? Attached patch fixes one such warning,
caused by having main() returning char instead of int.

 A couple of c.m4 macros declare function with return type char, and
then return same return value from main(). Attached patch translates
character from function into int 0 or 1 to be returned from main().


 - ML

autoconf_mainreturn.diff
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