Merge branch 'patch-1' into 'master'

Split openmeshcore static/shared MinGW compilation

As with ms compilers, the shared/static compilation depends on export macros.

Besides this is inconsistent with the behavior for openmeshtools library.

Why did you add this ?

See merge request !72

src/OpenMesh/Core/CMakeLists.txt

@@ -35,7 +35,7 @@ if ( NOT ${PROJECT_NAME} MATCHES "OpenMesh")
 endif()
 
 
-if (WIN32 AND NOT MINGW)
+if (WIN32)
 
   if ( OPENMESH_BUILD_SHARED )
     add_definitions( -DOPENMESHDLL -DBUILDOPENMESHDLL)