[CMake] Remove -D${target_name}_EXPORTS from shared library compilation flags

[Alexey Petruchik]

I know it's a bit weird but I need it. I'm currently working on moving
make-based project to cmake. I want to get absolutely the same flags as
current makefiles have, so I need to remove autogenerated
-D${target_name}_EXPORTS.

set_property(TARGET a PROPERTY DEFINE_SYMBOL "")

is not working for me. Can anyone help me with this issue?
Regards, Alexey
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