pull up r19618 from trunk

pull up r19618 from trunk

 r19618@cathode-dark-space:  jaltman | 2007-06-22 14:47:16 -0400
 ticket: 5584

 All exports in nidmgr32.dll are declared as __declspec(dllexport)
 using the KHMEXP macro in the header files.  However, since the same
 header files are used to declare imports when building applications
 and plug-ins that use nidmgr32.dll, the KHMEXP macro should switch to
 __declspec(import) so that the relevant import table entries are
 created.

 To make this switch, the source files that go into nidmgr32.dll are
 compiled with the special macro _NIMLIB_ defined that indicates that
 the KHMEXP should expand to __declspec(dllexport).  In the absence of
 this macro, KHMEXP will expand to __declspec(dllimport).

ticket: 5584
version_fixed: 1.6.3

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-6@19776 dc483132-0cff-0310-8789-dd5450dbe970