GCC 10.1.0 introduced the -moutline-atomics option which, when
enabled, use LSE instructions when the processor provides them.
The option is enabled by default and unfortunately causes the
following error at compile time:

 aarch64-linux-gnu-ld: /usr/lib/gcc/aarch64-linux-gnu/10.1.0/libgcc.a(lse-init.o): in function `init_have_lse_atomics':
 lse-init.c:(.text.startup+0xc): undefined reference to `__getauxval'

This is happening because we are linking against our own libcflat which
doesn't implement the function __getauxval().

Disable the use of the out-of-line functions by compiling with
-mno-outline-atomics.

Reported-by: Alexandru Elisei <alexandru.elisei@arm.com>
Tested-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Andrew Jones <drjones@redhat.com>
Message-Id: <20200728121751.15083-1-drjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>