GHC_NO_DIRENT_D_TYPE should be defined on Haiku

[Begasus]

Describe the bug
Filesystem fails to compile (filesystem/filesystem.hpp) on Haiku because of missing d_type in dirent structure.

Additional context
doxygen/doxygen#9610

[gulrak]

This is a valid solution for the used version ghc::filesystem v1.5.6, but with #142 this is not needed any more, as starting with v1.5.12 the code detects the presence of dirent.d_type automatically at compile time.

[Begasus]

Could still use the detection for Haiku, otherwise I'm getting: error "Operating system currently not supported!":

From: https://github.com/gulrak/filesystem/blob/master/include/ghc/filesystem.hpp#L79

#elif defined(__QNX__)
#define GHC_OS_QNX
+#elif defined(__HAIKU__)
+#define GHC_OS_HAIKU
#else

[Begasus]

Related PR: #163

[Begasus]

This can be closed I think, created a stand-alone package on Haiku with the related PR here, build and install seem OK.
I'm doing a build for catch2 to see if I can run the provided tests here also, thanks so far! :)

[gulrak]

You are right, I will add the detection.

[Begasus]

Upstream PR merged, thanks! 👍