create-diff-object: Include .rodata.str section in output object

On arm64 when CONFIG_DEBUG_BUGVERBOSE is enabled debugging information about
bug sections is stored in the ".rodata.str" section of the object file. If this
isn't included then linking fails as labels in this section are referenced
by relocations in the bug table.

Include this section to enable building patches which contain this bug debug
information.

Signed-off-by: Suraj Jitindar Singh <surajjs@amazon.com>

Author: Suraj Jitindar Singh

kpatch-build/create-diff-object.c

@@ -1950,6 +1950,7 @@ static void kpatch_include_standard_elements(struct kpatch_elf *kelf)
 		    !strcmp(sec->name, ".symtab") ||
 		    !strcmp(sec->name, ".toc") ||
 		    !strcmp(sec->name, ".rodata") ||
+		    !strcmp(sec->name, ".rodata.str") ||
 		    is_string_literal_section(sec)) {
 			kpatch_include_section(sec);
 		}