qemu4 bset on FreeBSD 12

[Joel Sherrill]

Hi

This one failed because pixman can't be built (again no gcc on this
machine):

Any ideas? Does this work for anyone?

+ cd rtems-tools-ca7b290f94a19238ed068aad229854cf67dee9b5
+ ./waf distclean configure '--prefix=/home/joel/rtems-cron-5/tools/5'
Fatal Python error: Py_Initialize: can't initialize sys standard streams
OSError: [Errno 9] Bad file descriptor

Current thread 0x00000008009e2000 (most recent call first):
Abort trap (core dumped)
shell cmd failed: /bin/sh -ex
 /usr/home/joel/rtems-cron-5/rtems-source-builder/
rtems/build/rtems-tools-ca7b290f94a19238ed068aad229854cf67dee9b5-1/do-build
error: building rtems-tools-ca7b290f94a19238ed068aad229854cf67dee9b5-1
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