[cmake-developers] [PATCH] Fixes to ExternalProject and it's tests

[Rolf Eike Beer]

These two patches address some issues I found:

-ExternalProject_Add(... DEPENDS something) does not work if that something is 
not itself created by ExternalProject_Add(). Fixed and testcase added.

-The testcases for ExternalProject fail to detect on my German system my 
Subversion version. We had the issue back in the FindSubversion.cmake some 
time again and fixed it there, no need to duplicate the old wrong code here.

The patches are independent of each other.

Greetings,

Eike
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