pkg/53578: xentools48 does not build

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         53578
>Category:       pkg
>Synopsis:       xentools48 does not build
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Sep 06 12:25:00 +0000 2018
>Originator:     Andreas Gustafsson
>Release:        NetBSD 7.2, 8.0, -current as of 2018.08.29.11.29.27
>Organization:
>Environment:
System: NetBSD
Architecture: x86_64
Machine: amd64
>Description:

Building the xentools48 package on NetBSD/amd64 fails with:

-- Build files have been written to: /tmp/sysutils/xentools48/work/xen-4.8.3/stubdom/tpm_emulator-x86_64/build
touch tpm_emulator-x86_64
Can't rename newlib-1.16.0/newlib/libm/math/e_hypot.c to newlib-1.16.0/newlib/libm/math/e_hypot.c.bak: Bad file descriptor, skipping file, <> line 1110194.
gmake[1]: *** [Makefile:80: newlib-1.16.0] Error 123
gmake[1]: Leaving directory '/tmp/sysutils/xentools48/work/xen-4.8.3/stubdom'
gmake: *** [Makefile:58: build-stubdom] Error 2
*** Error code 2

>How-To-Repeat:

>Fix: