misc/win32/rand.c include order change breaking VC6 build

[Curt Arnold]

Rev 421805 (2006/07/14) changed the sequence of imports in misc/win32/ 
rand.c

http://svn.apache.org/viewvc/apr/apr/trunk/misc/win32/rand.c? 
r1=170461&r2=421805

The change was mentioned in http://marc.info/?l=apr- 
dev&m=115285245603323&w=2.  I'm guessing it is MinGW related since it  
mentioned librpcrt4.a.

Xi Wang reported a compile failure related to this change in  
2006-09-18: http://marc.info/?l=apr-dev&m=115856814824660&w=2.  But  
the connection to the recent change did not seem to be made and there  
did not seem to be any follow through.

I'm seeing the same compile failure on my pretty vanilla VC6 set up  
(no later platform SDK, etc) on Windows 2000.

I'm also seeing compile failures in apr-util/include/apr_ldap.h and  
apr-util/misc/apr_thread_pool.c, but I haven't tracked them down.