Fixing compilation errors related to MUSL libc

Fix Musl libc NULL errors and unsupported pthread funcs for compatibility.
Also ensures cleanup and error handling irrespective of CPU affinity override.

Fix submitted by github dev - AngryLoki
https://github.com/ROCm/ROCR-Runtime/issues/181

Change-Id: Ia487315e504112be5d3370756f23f6e23b9ae4be


[ROCm/ROCR-Runtime commit: bc9cac97fe]

projects/rocr-runtime/runtime/hsa-runtime/core/inc/checked.h

@@ -58,7 +58,7 @@ template <uint64_t code, bool multiProcess = false> class Check final {
   Check(const Check&) { object_ = uintptr_t(this) ^ uintptr_t(code); }
   Check(Check&&) { object_ = uintptr_t(this) ^ uintptr_t(code); }
 
-  ~Check() { object_ = NULL; }
+  ~Check() { object_ = uintptr_t(NULL); }
 
   const Check& operator=(Check&& rhs) { return *this; }
   const Check& operator=(const Check& rhs) { return *this; }