gdbm: fix GCC 10 multiple def compilation error

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

libs/gdbm/patches/999-001-fix-multiple-def-gcc-10.patch

@@ -0,0 +1,11 @@
+--- a/src/parseopt.c
++++ b/src/parseopt.c
+@@ -255,8 +255,6 @@ print_option_descr (const char *descr, s
+ }
+ 
+ char *parseopt_program_name;
+-char *parseopt_program_doc;
+-char *parseopt_program_args;
+ const char *program_bug_address = "<" PACKAGE_BUGREPORT ">";
+ void (*parseopt_help_hook) (FILE *stream);
+