Fix handling of DEB/_DEBUG/NDEBUG symbols with MSVC
Fix handling of DEB/_DEBUG/NDEBUG symbols with MSVC

Thanks Qb for mentioning this problem in issue #184.

Tridify/oce,tpaviot/oce,mathstuf/oce,Tech-XCorp/oce,EvgeneOskin/oce,mathstuf/oce,heartvalve/oce,tpaviot/oce,Tridify/oce,EvgeneOskin/oce,BenoitPerrot/oce,heartvalve/oce,tpaviot/oce,finetjul/oce,BenoitPerrot/oce,mathstuf/oce,Tech-XCorp/oce,tpaviot/oce,heartvalve/oce,EvgeneOskin/oce,EvgeneOskin/oce,finetjul/oce,Tech-XCorp/oce,mathstuf/oce,heartvalve/oce,finetjul/oce,Tech-XCorp/oce,BenoitPerrot/oce,tpaviot/oce,mathstuf/oce,Tridify/oce,Tridify/oce,BenoitPerrot/oce,Tridify/oce,finetjul/oce,BenoitPerrot/oce,heartvalve/oce,EvgeneOskin/oce,Tech-XCorp/oce,finetjul/oce