build: avoid close, system
* src/fdstream.c (virFDStreamOpenFile, virFDStreamCreateFile): Use VIR_FORCE_CLOSE instead of close. * tests/commandtest.c (mymain): Likewise. * tools/virsh.c (editFile): Use virCommand instead of system. * src/util/util.c (__virExec): Special case preservation of std file descriptors to child.
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