MSVC syntax errors in Manager.cpp

[jsrgb]

Building the array_multiplication example:

C:\Users\conne\Desktop\kompute-latest\src\Manager.cpp(20,27): error C2143: syntax error: missing ';' before '__cdecl' [C:\Users\conne\Desktop\kompute-latest\examples\array_
multiplication\build\kompute_build\src\kompute.vcxproj]
C:\Users\conne\Desktop\kompute-latest\src\Manager.cpp(20,18): warning C4229: anachronism used: modifiers on data are ignored [C:\Users\conne\Desktop\kompute-latest\examples
\array_multiplication\build\kompute_build\src\kompute.vcxproj]
C:\Users\conne\Desktop\kompute-latest\src\Manager.cpp(20,18): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int [C:\Users\conne\Desk
top\kompute-latest\examples\array_multiplication\build\kompute_build\src\kompute.vcxproj]
C:\Users\conne\Desktop\kompute-latest\src\Manager.cpp(20,38): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int [C:\Users\conne\Desk
top\kompute-latest\examples\array_multiplication\build\kompute_build\src\kompute.vcxproj]

Changing VKAPI_PTR to VKAPI_ATTR resolves the error.

[axsaucedo]

Thank you for the heads up @jamorphy, it seems this is something we may need to add for fix, could you open a PR?

[jsrgb]

merged in #418