regression in Newlib 4.2.0 (lgammaf)

[Paul Zimmermann]

       Hi,

a third regression in Newlib 4.2.0 for single precision:

Checking lgamma with newlib-4.2.0.20211231
MPFR library: 4.1.0       
MPFR header:  4.1.0 (based on 4.1.0)
Checking function mylgammaf with MPFR_RNDN
libm wrong by up to 8.93e+43 ulp(s) for x=-0x1p-70
mylgamma      gives inf
mpfr_mylgamma gives 0x1.842994p+5

The largest error for lgammaf in Newlib 4.1.0 was 7.50e6 ulps
(for x=-0x1.3a7fcap+1).

Paul