Fails to compile in XCode/iOS with precompiled headers enabled.

[craigsteyn]

Hey,
I've been using enkiTS for a while now and I've really enjoying it. After using it on Win32, it worked on Android/Clang with only 1 unused variable when _DEBUG is not defined int err = sem_init( &semaphoreid.sem, 0, 0 ); Happy to open another issue / PR for this.

I then went ahead and moved it over to iOS and ran into this Issue.
I understand this is avoidable by adding enkiTS as its own lib/project in xcode, which I plan to do, however I wanted to bring this to your attention either way.
when precompiled headers are turned on and the precompiled header happens to have malloc.h included, the compiler throws this error:

/enkits/TaskScheduler.cpp:87:9: error: expected identifier
        THREAD_STATE_NONE,                  // shouldn't get this value
        ^
In file included from /precompiled-header.pch:14:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include/malloc/malloc.h:28:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include/mach/mach_types.h:87:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include/mach/exception_types.h:182:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include/mach/thread_status.h:76:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include/mach/machine/thread_status.h:33:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include/mach/arm/thread_status.h:55:34: note: expanded from macro 'THREAD_STATE_NONE'
#define THREAD_STATE_NONE        5

For me to get around it I renamed THREAD_STATE_NONE however you could also undefine THREAD_STATE_NONE when __APPLE__ is defined since TaskScheduler.cpp doesn't use it.

[dougbinks]

Thanks for the report - that's an annoying name collision but since it's not in the API I can easily rename the enums, and I'll fix the other error too at the same time.

[dougbinks]

Fixes for these have now been merged into master - let me know if there's any problems.

Thanks again for the report!