[PATCH v2] NEWS: Mention testing glibc build with different compilers

[Paul Zimmermann]

for the record with revision 15ab68b and

  $ ../configure --prefix=/usr TEST_CC=clang TEST_CXX=clang++

I got with make check on a x86_64 under Debian with gcc 14.2.0:

     33 FAIL
   5509 PASS
     53 UNSUPPORTED
     16 XFAIL
      4 XPASS

FAIL: conform/ISO11/inttypes.h/conform
FAIL: conform/ISO11/stdint.h/conform
FAIL: conform/ISO11/tgmath.h/conform
FAIL: conform/ISO99/inttypes.h/conform
FAIL: conform/ISO99/stdint.h/conform
FAIL: conform/ISO99/tgmath.h/conform
FAIL: conform/POSIX2008/inttypes.h/conform
FAIL: conform/POSIX2008/stdint.h/conform
FAIL: conform/POSIX2008/tgmath.h/conform
FAIL: conform/XOPEN2K/inttypes.h/conform
FAIL: conform/XOPEN2K/stdint.h/conform
FAIL: conform/XOPEN2K/tgmath.h/conform
FAIL: conform/XOPEN2K8/inttypes.h/conform
FAIL: conform/XOPEN2K8/stdint.h/conform
FAIL: conform/XOPEN2K8/tgmath.h/conform
FAIL: elf/ifuncmain1static
FAIL: elf/ifuncmain4
FAIL: elf/ifuncmain4static
FAIL: elf/ifuncmain6pie
FAIL: elf/ifuncmain7
FAIL: elf/ifuncmain7pic
FAIL: elf/ifuncmain7picstatic
FAIL: elf/ifuncmain7pie
FAIL: elf/ifuncmain7static
FAIL: math/test-float128-isgreater
FAIL: math/test-float128-isgreaterequal
FAIL: math/test-float128-isless
FAIL: math/test-float128-islessequal
FAIL: math/test-float64x-fpclassify
FAIL: math/test-ldouble-fpclassify
FAIL: math/test-tgmath
FAIL: math/test-tgmath2
FAIL: stdio-common/tst-vfprintf-user-type

Paul