Pull up following revision(s) (requested by sevan in ticket #435):
tools/compat/compat_defs.h: 1.108
tools/compat/configure: 1.87-1.88
tools/compat/configure.ac: 1.88-1.89
tools/compat/fpurge.c: 1.2
tools/compat/nbtool_config.h.in: 1.41-1.42
handle __fpurge being declared in <stdio_ext.h>
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regen
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Add asnprintf() to the AC_CHECK_DECLS list.
Resolves conflict when cross compiling on Cygwin the provided implementation
does not get picked up.
Closes PR toolchain/52797
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regen

(snj)