[Bug go/84484] libgo configure tests fail to find -latomic

[sch...@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84484

--- Comment #9 from Andreas Schwab <sch...@linux-m68k.org> ---
That does not work because CFLAGS gets reset after the test.  Only
PTHREAD_CFLAGS survives.