ENH: make it work on non windows

Tests/Framework/bar.cxx

@@ -1,5 +1,7 @@
 #ifdef _WIN32
 #  define CM_TEST_LIB_IMPORT  __declspec( dllimport )
+#else 
+#  define CM_TEST_LIB_IMPORT
 #endif
 CM_TEST_LIB_IMPORT void foo();
 int main()

Tests/Framework/foo.cxx

@@ -1,6 +1,8 @@
 #include <stdio.h>
 #ifdef _WIN32
 #  define CM_TEST_LIB_EXPORT  __declspec( dllexport )
+#else 
+#  define CM_TEST_LIB_EXPORT
 #endif
 CM_TEST_LIB_EXPORT void foo()
 {