component/gdbm: version up and patch

we need the patch to be able to build with gcc 10 (used on Archlinux for example).
See https://bugs.gentoo.org/705898
patch is coming from https://705898.bugs.gentoo.org/attachment.cgi?id=603950

component/gdbm/buildout.cfg

 [buildout]
+extends =
+  ../patch/buildout.cfg
 parts =
   gdbm
 
 [gdbm]
 recipe = slapos.recipe.cmmi
 shared = true
-version = 1.11
+version = 1.18
 url = ftp://ftp.gnu.org/gnu/gdbm/gdbm-${:version}.tar.gz
-md5sum = 72c832680cf0999caedbe5b265c8c1bd
+md5sum = e316f8e4a3e7e4f23955be65d54fec48
+patch-options = -p1
+patches =
+  ${:_profile_base_location_}/extern_parseopt.patch#30baeaaa0c6a6e6be8cf56a875726619
 configure-options =
   --disable-static
   --enable-libgdbm-compat
+environment =
+  PATH=${patch:location}/bin:%(PATH)s
 # install as parts/gdbm/include/gdbm/*.h etc. because some softwares
 # (eg. python's dbmmodule.c extension) assume the location like this.
 includedir = @@LOCATION@@/include
 make-targets =
   install includedir=${:includedir}/gdbm && rm -f ${:includedir}/*.h && ln -sf gdbm/gdbm.h ${:includedir}/gdbm.h
-# it seems that parallel build sometimes fails for gdbm.
-make-options =
-  -j1

component/gdbm/extern_parseopt.patch

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