LUCY-168 Detect sys/stat.h mkdir under Cygwin.
LUCY-168 Detect sys/stat.h mkdir under Cygwin.

Always run the code which looks for POSIX mkdir() from sys/stat.h instead of 
limiting ourselves to Microsoft options when windows.h is detected.


git-svn-id: 0e6074679e66e8f1cc73dfc755b08bab367f805b@1140400 13f79535-47bb-0310-9956-ffa450edef68

pombredanne/apache-lucy,apache/lucy,pombredanne/apache-lucy,kidaa/lucy,rbevers/lucy,rbevers/lucy,nwellnhof/lucy,rectang/lucy,rectang/lucy,rbevers/lucy,rectang/lucy,rbevers/lucy,rbevers/lucy,kidaa/lucy,apache/lucy,rectang/lucy,nwellnhof/lucy,apache/lucy,rectang/lucy,pombredanne/apache-lucy,rectang/lucy,pombredanne/apache-lucy,kidaa/lucy,rbevers/lucy,nwellnhof/lucy,rectang/lucy,nwellnhof/lucy,nwellnhof/lucy,apache/lucy,apache/lucy,kidaa/lucy,kidaa/lucy,pombredanne/apache-lucy,kidaa/lucy,rbevers/lucy,nwellnhof/lucy,kidaa/lucy,kidaa/lucy,pombredanne/apache-lucy,pombredanne/apache-lucy,nwellnhof/lucy,apache/lucy,apache/lucy