libunwind: fix comment dependencies

Comment should be shown when no threads OR not uclibc-snapshot / glibc, not
AND.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libunwind/Config.in

@@ -12,5 +12,4 @@ config BR2_PACKAGE_LIBUNWIND
 comment "libunwind needs a uclibc snapshot or (e)glibc toolchain w/ threads"
 	depends on BR2_arm || BR2_armeb || BR2_mips || BR2_mipsel || BR2_mips64 || \
 		BR2_mips64el || BR2_powerpc || BR2_sh || BR2_sh64 || BR2_i386 || BR2_x86_64
-	depends on !BR2_TOOLCHAIN_HAS_THREADS
-	depends on !(BR2_UCLIBC_VERSION_SNAPSHOT || BR2_TOOLCHAIN_USES_GLIBC)
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || !(BR2_UCLIBC_VERSION_SNAPSHOT || BR2_TOOLCHAIN_USES_GLIBC)