add variable to define directory for tmp-directories

sometimes it's necessary to not build inside the mxe folder. The
variable MXE_TMP can be used to change the base directory for creating
tmp directories that are used for building.

Rationale: when using virtualbox to build the cross-compile environment
and the mxe project is in a shared folder, at least stripping is not
working because of an internal error of the shared filesystem.  So the
solution is to change the tmp-directory to a place inside the VM.

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