package/cmake: (ctest) add support for riscv architecture

Package binaries can be successfully built for and then executed on
RISC-V platforms including RV32 and RV64 variants. Tested in QEMU.

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/cmake/Config.in

@@ -6,7 +6,7 @@ config BR2_PACKAGE_CMAKE_ARCH_SUPPORTS
 		BR2_mipsel    || BR2_mips64el    || BR2_powerpc  || \
 		BR2_powerpc64 || BR2_powerpc64le || BR2_sparc    || \
 		BR2_i386      || BR2_x86_64      || BR2_xtensa   || \
-		BR2_s390x
+		BR2_s390x     || BR2_riscv
 
 config BR2_PACKAGE_CMAKE
 	bool