Patch cleans up and fixes dependencies of 'vala' in the following way:
* remove deps on 'gtk+' + 'dbus'; these packages are not required and
'gkt+' is high barrier preventing using 'vala' on headless systems
* 'bison-native' is required both on native and target builds; 'DEPENDS'
and 'DEPENDS_virtclass-native' and 'DEPENDS' can be merged hence
* 'flex-native' is required
* although 'xsltproc' (from libxslt-native) is optional, a dependency
on it was added to make builds deterministic. An alternative method
might be 'EXTRA_OECONF += "ac_cv_path_XSLTPROC=:"' but this is error
prone as it depends on internals of the build system.
Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
