[CMake] Extended path for imported .proto files in the FindProtobuf module

[Miroslav Kes]

Hi,

The current  implementation (as of 2.3.8)  of the FindProtobuf module 
implicitly assumes that the imported .proto files are located only in the 
${CMAKE_CURRENT_SOURCE_DIR}. This may not be true for more complex source 
directory structure.
 
The attached patch allows users to override the default by setting an 
external variable (PROTOBUF_IMPORT_DIRS) prior to the 
PROTOBUF_GENERATE_CPP call.
It also fixes the bug #0010997 which si still pending in the bug tracking 
system.



Regards

Mira
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