Support for musl

[Henri]

Dear developers,

The config.guess script currently only checks for the glibc, uclibc, and 
dietlibc libraries.  The
attached patch adds support for the musl C library.  Unfortunately, features.h 
in musl does not
define a __MUSL__ macro (or similar) which is why this has to be the new 
default case instead of
glibc.  If features.h or a C compiler are not available it will default to gnu 
as before.

Kind regards,
Henri

musl.patch
Description: Text Data