RISC-V will emit ".option nopic" when -fno-pie is in effect, which
matches the generic pattern. Just like done for Alpha, special-case
RISC-V.

gcc/testsuite/

	* c-c++-common/patchable_function_entry-decl.c: Special-case
	RISC-V.
	* c-c++-common/patchable_function_entry-default.c: Likewise.
	* c-c++-common/patchable_function_entry-definition.c: Likewise.