Starting with checkin

http://core.tcl.tk/tcl/info/e733a91cdb

a valgrind of test iocmd-11.4 reports
a memory leak in the child process.

==29751== 88 (48 direct, 40 indirect) bytes in 1 blocks are definitely lost in loss record 1,103 of 2,070
==29751==    at 0x4A0610C: malloc (vg_replace_malloc.c:195)
==29751==    by 0x5D1CA6: TclpAlloc (tclAlloc.c:699)
==29751==    by 0x43D296: Tcl_Alloc (tclCkalloc.c:1059)
==29751==    by 0x5A4465: Tcl_ConditionWait (tclUnixThrd.c:541)
==29751==    by 0x5A4F9E: Tcl_InitNotifier (tclUnixNotfy.c:333)
==29751==    by 0x552F43: TclInitNotifier (tclNotify.c:136)
==29751==    by 0x4FC8FC: TclInitSubsystems (tclEvent.c:1062)
==29751==    by 0x42B2EB: Tcl_CreateInterp (tclBasic.c:477)

Committed fix to trunk that valgrind reports
to be effective.