module: reduce string table for loaded modules (v2)

Also remove all parts of the string table (referenced by the symbol
table) that are not needed for kallsyms use (i.e. which were only
referenced by symbols discarded by the previous patch, or not
referenced at all for whatever reason).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/include/linux/module.h b/include/linux/module.h
index 1d3ccb1..aca9803 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -315,7 +315,7 @@
 	 */
 	Elf_Sym *symtab, *core_symtab;
 	unsigned int num_symtab, core_num_syms;
-	char *strtab;
+	char *strtab, *core_strtab;
 
 	/* Section attributes */
 	struct module_sect_attrs *sect_attrs;