"©" character in .cpp files fails build under Windows with codepage 950

[mikekaganski]

The .cpp files include out-of-US-ASCII (>127) character "©", which causes this warning (and error when -werror is used globally):

..\src\log.cpp : error C2220: warning treated as error - no 'object' file generated [C:\src\lo\workdir\UnpackedTarball\twain_dsm\visual_studio\TWAIN_DSM_VS2015.vcxproj]
..\src\log.cpp : warning C4819: The file contains a character that cannot be represented in the current code page (950). Save the file in Unicode format to prevent data loss [C:\src\lo\workdir\UnpackedTarball\twain_dsm\visual_studio\TWAIN_DSM_VS2015.vcxproj]

Either utf-8 with BOM encoding could be used in that case for source files, or some way of explicit marking of proper encoding of the files in vcproject files, or maybe simple replacement of "©" with "(C)".