whitelisting additional matherr funcs for conform tests

[Mike Frysinger <vapier at gentoo dot org>]

glibc supports the deprecated matherr hook for math error reporting.  the 
conform tests take this into consideration and whitelist this symbol when 
running linknamespace tests:
conform/linknamespace.pl:
	# * False positive: matherr only used conditionally.
	@whitelist = qw(... matherr ...);

the ia64 libm code has long provided two additional hooks in this space:
	matherrf (for floats)
	matherrl (for long doubles)

which causes the conform tests to fail with chains that all look like:
	[initial] __atan2 ->
	[libm.a(e_atan2.o)] __libm_error_support -> 
	[libm.a(libm_error.o)] matherrf

we can't (losslessly) redirect existing usage of these funcs to matherr
because the structure passed in is different -- matherr uses a struct with
doubles while matherrf/matherrl use floats and long doubles respectively.
plus, this has been part of the exported ABI since glibc-2.2.3, so it
doesn't feel right to change it so late.

would it be possible to whitelist these two funcs for the ia64 port ?
not sure if that's easily possible with the code as-is, and whitelisting
it for all arches seems wrong as it'd allow other ports to screw up too.

-@whitelist = qw(signgam stdin stdout stderr re_syntax_options matherr);
+@whitelist = qw(signgam stdin stdout stderr re_syntax_options matherr
+		matherrf matherrl);
-mike

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