component/gdbm: add support for newer architecture (e.g. riscv)

component/gdbm/buildout.cfg

 [buildout]
+extends =
+  ../gnu-config/buildout.cfg
 parts =
   gdbm
 
@@ -8,6 +10,7 @@ shared = true
 version = 1.23
 url = http://ftp.gnu.org/gnu/gdbm/gdbm-${:version}.tar.gz
 md5sum = 8551961e36bf8c70b7500d255d3658ec
+pre-configure = cp -f ${gnu-config:location}/config.sub ${gnu-config:location}/config.guess build-aux/
 configure-options =
   --disable-static
   --enable-libgdbm-compat