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
Windows: Make file delete/rename retry configurable

Several CMake operations need to replace files in rapid succession.
This commonly fails on Windows due to filesystem lock behavior so
we have retry loops.  No matter how many times we retry or how long
we delay there will inevitably be someone with an environment that
needs more.  Make the retry count and delay configurable in the
Windows Registry keys:

 {HKCU,HKLM}/Software/Kitware/CMake/Config

in DWORD values

 FilesystemRetryCount = Number of tries
 FilesystemRetryDelay = Delay in milliseconds between tries

Leave the feature undocumented for now to see how it goes.
cmake-mode.el: Add the ability to retrieve module help.
cmake-mode.el: Add help for variables/properties/complete. Factorize.
cmTarget: Don't try to get sources of an INTERFACE_LIBRARY.

An an assert to ensure this.
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 'isystemForIcpc'

cab5ebd4 Intel compiler: add -isystem flag under Linux
Merge topic 'KateHandleSpacesInPath'

22e5c6c2 Kate: handle spaces in build dir
Merge topic 'emacs-mode-cmake-help'

9d35f7c4 cmake-mode.el: Add help for variables/properties/complete. Factorize.
7cc21e9a cmake-mode.el: Add the ability to retrieve module help.
Merge topic 'INTERFACE-no-sources'

9db9c1fc cmTarget: Don't try to get sources of an INTERFACE_LIBRARY.
Merge topic 'windows-filesystem-retry-config'

7b1f966a Windows: Make file delete/rename retry configurable