Fixed unit tests build for platforms libbe_test and r5. Only randomly tested

a few whether they actually work.
New pseudo target "unittests", which builds all unit tests for the currently
set TARGET_PLATFORM. They are placed in generated/tests/<platform>/unittests.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14791 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/tests/ExampleTestAddon.cpp

@@ -1,6 +1,7 @@
 #include <TestSuite.h>
 #include <TestSuiteAddon.h>
-#include <ExampleTest.h>
+
+#include "ExampleTest.h"
 
 BTestSuite* getTestSuite() {
 	BTestSuite *suite = new BTestSuite("ExampleSuite");