[PATCH] kdeplasma-addons - only build rss/news plasmoids if rss dataengine is guessed to be available

[Maciej Mrozowski]

Now it's possible to build and install plasmoids that have runtime only 
dependency on KdepimLibs. This allows to install dysfunctional (as plasma may 
lack RSS dataengine in this case) rss/news plasmoids.
https://bugs.gentoo.org/show_bug.cgi?id=288154

Well, patch does not exactly do what it's supposed to since actually there's 
no way to do CMake check whether RSS dataengine is built and available 
(workspace/plasma), but it tries to guess it from kdepimlibs presence (so it 
fixes issue for those who build plasma and kdeplasma-addons in same build env 
which is common case I think).

Changes in patches:
- build rssnow and news plasmoids when kdepimlibs found (disabling them allows 
to match unsatisfied kdepimlibs deps in kdeplasma-addons with unsatisfied 
kdepimlibs deps in plasma-workspace which provides rss dataengine)
 - remove if(QT_WEBKIT_FOUND) guards to simplify patch and for consistency 
since not all plasmoids needing WebkIt are currently covered by this check 
anyway (not covered: webslice, weather, community in KDE SC 4.4 and 
corresponding trunk plasmoids) so WebKit is pretty much required anyway
- use newer KDEPIMLIBS_<component>_LIBS instead of KDE4_<component>_LIBS
- some minor formatting (only to keep consistency, yeah I know i have a bad 
habit of doing too many changes in the process :P)

Full patches attached

Ok to commit?
(-4.4.3- for 4.4 branch, -4.4.74- for trunk)

-- 
regards
MM
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