openplugins.inc: Remove DEPENDS=enigma2

A DEPENDS on enigma2 is only needed if the plugin imports something (libs, headers)
from enigma2. This is rarely, if ever, the case, so remove the hard DEPENDS.

This fixes the problem that most plugins are being rebuilt daily even when there
were no changes.

openplugins.inc

@@ -1,5 +1,3 @@
-DEPENDS += "enigma2"
-
 SRC_URI = "git://github.com/E2OpenPlugins/e2openplugin-${MODULE}.git;protocol=git"
 
 S="${WORKDIR}/git"