Fix minidump test app build under Windows
Fix minidump test app build under Windows

Add conversion between std::string and std::wstring

MD-20241
test: none

spthaolt/breakpad,Mendeley/breakpad,gvaf/breakpad,spthaolt/breakpad,gvaf/breakpad,Mendeley/breakpad,Mendeley/breakpad,sinuos/breakpad,Mendeley/breakpad,gvaf/breakpad,spthaolt/breakpad,gvaf/breakpad,sinuos/breakpad,sinuos/breakpad,spthaolt/breakpad,sinuos/breakpad