ruby: remove spurious db build dependency

The dbm module uses gdbm by default which is also a build dependency.

(From OE-Core rev: 79121ff54420e5cc331552ca5620aed81a36aac9)

(From OE-Core rev: 20d9821e9131c3d715ed629ad38eed802f737056)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/ruby/ruby.inc

@@ -14,7 +14,7 @@ LIC_FILES_CHKSUM = "\
     file://LEGAL;md5=daf349ad59dd19bd8c919171bff3c5d6 \
 "
 
-DEPENDS = "ruby-native zlib openssl tcl libyaml db gdbm readline"
+DEPENDS = "ruby-native zlib openssl tcl libyaml gdbm readline"
 DEPENDS_class-native = "openssl-native libyaml-native"
 
 SHRT_VER = "${@oe.utils.trim_version("${PV}", 2)}"