PGDLLEXPORT is __declspec (dllexport) only on MSVC,

but is __declspec (dllimport) on other compilers
because cygwin and mingw don't like dllexport.

src/include/port/cygwin.h

-/* $PostgreSQL: pgsql/src/include/port/cygwin.h,v 1.8 2010/05/27 07:59:48 itagaki Exp $ */
+/* $PostgreSQL: pgsql/src/include/port/cygwin.h,v 1.9 2010/05/28 16:34:15 itagaki Exp $ */
 
 #include <cygwin/version.h>
 
@@ -19,4 +19,4 @@
 #define PGDLLIMPORT __declspec (dllimport)
 #endif
 
-#define PGDLLEXPORT __declspec (dllexport)
+#define PGDLLEXPORT __declspec (dllimport)

src/include/port/win32.h

-/* $PostgreSQL: pgsql/src/include/port/win32.h,v 1.94 2010/05/27 07:59:48 itagaki Exp $ */
+/* $PostgreSQL: pgsql/src/include/port/win32.h,v 1.95 2010/05/28 16:34:15 itagaki Exp $ */
 
 #if defined(_MSC_VER) || defined(__BORLANDC__)
 #define WIN32_ONLY_COMPILER
@@ -58,7 +58,11 @@
 #define PGDLLIMPORT __declspec (dllimport)
 #endif
 
+#ifdef _MSC_VER
 #define PGDLLEXPORT __declspec (dllexport)
+#else
+#define PGDLLEXPORT __declspec (dllimport)
+#endif
 
 #else							/* not CYGWIN, not MSVC, not MingW */
 #define PGDLLIMPORT