Intel compiler: add -isystem flag under Linux

This makes the SYSTEM keyword work with the Intel compiler
under Linux. AFAIK this is supported neither under Windows nor OSX.

Alex
CMake Nightly Date Stamp
CMake Nightly Date Stamp
Merge topic 'isystemForIcpc' into next

cab5ebd4 Intel compiler: add -isystem flag under Linux
Kate: handle spaces in build dir

They need to be escaped in the json file... I'm quite
sure I tested this before, obviously I didn't test it
correctly.

Alex
Merge topic 'KateHandleSpacesInPath' into next

c98b69bd Kate: handle spaces in build dir
0c958c44 CMake Nightly Date Stamp
66bf1783 CMake Nightly Date Stamp
Fix std::size_t test.
Merge topic 'cmake-toolchain-requirements' into next

617796ea Fix std::size_t test.
kate: fix line lengths

Alex
Merge topic 'KateHandleSpacesInPath' into next

3a1978a6 kate: fix line lengths