Increased the default thread stack size to 64K. The patch is contributed by aaronr@us.ibm.com and Michael Kaply <mkaply@us.ibm.com>. Modified files: _os2.h os2cv.c os2io.c os2thred.c git-svn-id: svn://10.0.0.236/trunk@110859 18797224-902f-48f8-a5cc-f745e15eee43