*ucontext functions are only implemented for a subset of
uClibc supported architectures. To allow the external library
libucontext to be used this small patch is required.
Tested for riscv64.
Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit f761a8c4516d88d70ae6f5d192fdb99cafa761a6)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
574d6b1288