Make check failure with gcc-4.1 on PPC

[Steve Munroe]

It seems that gcc-4.1 is getting getting more agressive using the
powerpc fused-multiply-add (fmadd) which impacts the code gen (and
rounding) for the bessel functions y1() and yn(). This causes
math/test-float and math/test-double to report failures. This failure
occurs for both powerpc32 and powerpc64.

I reported this in bugzilla # 1384
<http://sources.redhat.com/bugzilla/show_bug.cgi?id=1384> and provided a
patch to libm-test-ulps as an attachment. The patch allows make check to
pass with either gcc-3.4 or gcc-4.1.