races in toolstack build

[Olaf Hering <olaf@xxxxxxxxx>]

With commit 68a8aa5d72 the build randomly fails. Up to commit c7e3021a71 no 
errors (like this) are seen. For some reason nothing below tools/ was touched 
in this range, so the bug may already exist for a while.

attempt on host#1:
[   81s] ln: failed to create symbolic link 
'/home/abuild/rpmbuild/BUILD/xen-4.15.20200922T102230.68a8aa5d72/non-dbg/tools/libs/ctrl/../../../tools/include/xenctrl_dom.h':
 File exists
[   81s] 
/home/abuild/rpmbuild/BUILD/xen-4.15.20200922T102230.68a8aa5d72/non-dbg/tools/libs/ctrl/../../../tools/libs/libs.mk:82:
 recipe for target 
'/home/abuild/rpmbuild/BUILD/xen-4.15.20200922T102230.68a8aa5d72/non-dbg/tools/libs/ctrl/../../../tools/include/xenctrl_compat.h'
 failed
[   81s] make[6]: *** 
[/home/abuild/rpmbuild/BUILD/xen-4.15.20200922T102230.68a8aa5d72/non-dbg/tools/libs/ctrl/../../../tools/include/xenctrl_compat.h]
 Error 1

attempt on host#2:
[  178s] xenstat_qmp.c:26:10: fatal error: _paths.h: No such file or directory
[  178s] 
me/abuild/rpmbuild/BUILD/xen-4.15.20200922T102230.68a8aa5d72/non-dbg/tools/libs/stat/../../../tools/Rules.mk:153:
 xenstat_qmp.opic] Error 1


Olaf

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