Disable tests to avoid MMU dependency due to fork.

Fixes
CMakeFiles/regression.dir/regression.c.o: In function `_test_file_locks':
/home/br/br4/output/build/libical-v1.0.1/src/test/regression.c:(.text+0x96d8): undefined reference to `_fork'

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>

diff -uNr libical-1.0.1.org/src/CMakeLists.txt libical-1.0.1/src/CMakeLists.txt
--- libical-1.0.1.org/src/CMakeLists.txt	2014-10-09 17:07:05.000000000 +0200
+++ libical-1.0.1/src/CMakeLists.txt	2015-04-25 17:41:22.657345548 +0200
@@ -1,7 +1,6 @@
 add_subdirectory(libical)
 add_subdirectory(libicalss)
 add_subdirectory(libicalvcal)
-add_subdirectory(test)
 
 if(MSVC)
   install(FILES