fix build error on ARM due to wrong glibc check
the test for glibc < 2 "succeeds" wrongly for any non-glibc C library, and breaks the build on musl libc. we must first test if __GLIBC__ is defined at all, before using it unconditionally. Signed-off-by: NJohn Spencer <maillist-qemu@barfooze.de> Reviewed-by: NStefan Weil <sw@weilnetz.de> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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