thrift: Add dependency on atomic intrinsics

Thrift requires GCC built-in atomic functions which are architecture specific
and may not be implemented.

[Thomas: remove incorrect empty newline at end of Config.in.]

Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>