Change IS_MODULE to SHARED_MODULE in Win32 to match Unix. Also remove

IS_MODULE definitions from source files, move them to mak/dsp files
(all of them).

In related code, also have API_EXPORT use dllimport instead of
dllexport when SHARED_MODULE is defined (according to the VC++
docs, this results in "more efficient code") and fix API_EXPORT
redefinition in hsregex.h.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80809 13f79535-47bb-0310-9956-ffa450edef68