package/libunwind: enable on riscv 64-bit glibc

Since upstream commit [1], first included in version 1.6.0,
libunwind supports 64-bit riscv, at least with glibc.

[1] https://github.com/libunwind/libunwind/commit/abd15da8afb35b92ed0cb2c47f6564775b976c24

Signed-off-by: Vladimir Kondratiev <vladimir.kondratiev@mobileye.com>
[Julien: add link to upstream commit and fix version in commit log]
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/libunwind/Config.in

@@ -26,7 +26,7 @@ config BR2_PACKAGE_LIBUNWIND_ARCH_SUPPORTS
 	default y if BR2_TOOLCHAIN_USES_GLIBC && \
 		(BR2_ARM_CPU_HAS_ARM || BR2_aarch64 || BR2_mips || BR2_mipsel || \
 		 BR2_mips64 || BR2_mips64el || BR2_powerpc || BR2_sh || \
-		 BR2_i386 || BR2_x86_64)
+		 BR2_i386 || BR2_x86_64 || (BR2_riscv && BR2_ARCH_IS_64))
 	default y if BR2_TOOLCHAIN_USES_UCLIBC && \
 		(BR2_ARM_CPU_HAS_ARM || BR2_mips || BR2_mipsel || \
 		 BR2_mips64 || BR2_mips64el || BR2_x86_64)