[arch-general] Drop windowmaker-crm-git from [extra], use windowmaker package

[Daniel Isenmann]

Hi,

now that Window Maker development resumed and the new source for the 
official Window Maker package is the git repository of crm, there is no 
need anymore to have the crm-git package in the [extra] repository 
beside the official stable package. I will move it to AUR soon and will 
maintain it at the AUR.

To all the users of the windowmaker-crm-git package, please install the 
windowmaker package from the [extra] repository, which is the latest 
stable source from windowmaker.org and even newer than the crm-git 
package. All features which are in the crm-git package are merged to the 
official windowmaker package because of the same source.

  -Daniel