Use ccache to speed up rebuilds

Registered by Borim

When preparing for the libreoffice impress sprint in dresden (https://wiki.documentfoundation.org/Marketing/Events/ImpressSprint2013).
I realized that they use a nice program to reduce the compile time: ccache (http://ccache.samba.org/)

How about using ccache for wirdelands, too?

I made a little benchmarking on my lenovo X121e (cpu: AMD E-350, dual core, 1,6 GHz):

complete build with g++: 35m 24.787s

first complete build with ccache: 36m 15.745s
rebuilds with ccache: 5m 58.165s

Blueprint information

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Complete
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Drafter:
Borim
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Needs approval
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Definition:
Obsolete
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Implementation:
Beta Available
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Started by
Borim
Completed by
Borim

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