[CBRD-21754] Add __declspec(dllexport) macro in porting.h for windows #3759
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http://jira.cubrid.org/browse/CBRD-21754
Motivation
the legacy macro, EXPORT_VAR, IMPORT_VAR is not used in every place.
We have the .def files to specify exporting functions. But the lists are not managed well, and it is also a burden for developers.
Also, For C++ classes, when you want to export the functions in a class, every function should be explicitly specified in the .def file.
Implementation
As a first step of removing *.def file, I've added the MSVC keywords macro to export/import symbols to/from WIndows DLL's in porting.h.
Remarks
N/A