This is used with Clang, which does have native SEH, but it's broken and can cause the compiler to crash. Previously some code was not handling this and instead used native SEH for clang. Fix this by always using _SEH2_* macros instead of relying on __USE_PSEH2__ to be defined.
Try to improve things
Also, put include directory next to the library and use
target_include_directories(.. INTERFACE ..) to get this right.
This is because :
- Having includes & implementation in two different places buggers me
- This makes sure that there is no "if it compiles everything is fine" behaviour from anyone
because now even static libraries need it for GCC amd64 build
Also add __USE_PSEH2__ define for the non SEH-aware compilers out there and use it in a few headers
where we define macros involving __try
