libcxx: Apply 0001_fix_stdatomic_h_miss_typedef.patch to libcxx.defs

0001_fix_stdatomic_h_miss_typedef.patch is only applied to cmake,
so apply it to Makefile as well.

Author: SPRESENSE

libs/libxx/libcxx.defs

@@ -29,6 +29,7 @@ libcxx: libcxx-$(LIBCXX_VERSION).src.tar.xz
 	$(Q) tar -xf libcxx-$(LIBCXX_VERSION).src.tar.xz \
 	         --exclude libcxx-$(LIBCXX_VERSION).src/test/std/pstl
 	$(Q) mv libcxx-$(LIBCXX_VERSION).src libcxx
+	$(Q) patch -p0 < 0001_fix_stdatomic_h_miss_typedef.patch
 	$(Q) patch -p2 < mbstate_t.patch
 	$(Q) patch -p0 < 0001-libcxx-remove-mach-time-h.patch
 	$(Q) touch $@