MSVC: incremental linking issues warning

To reproduce

• build tests\manual\hello with debug build variant
• touch src\main.cpp
• build again with debug build variant

Linker prints the warning "HelloWorld.exe not found or not built by the last incremental link; performing full link".

This happens because: We're embedding a manifest after linking. Every change of the .exe or .dll after linking will disable the incremental linker feature for the next build.