MingW compilation (windows). Includes various refactoring to improve portability.

llvm-svn: 189107
diff --git a/lldb/source/API/SBHostOS.cpp b/lldb/source/API/SBHostOS.cpp
index a8f7db9..1664031 100644
--- a/lldb/source/API/SBHostOS.cpp
+++ b/lldb/source/API/SBHostOS.cpp
@@ -42,7 +42,7 @@
 SBHostOS::ThreadCreate
 (
     const char *name,
-    void *(*thread_function)(void *),
+    thread_func_t thread_function,
     void *thread_arg,
     SBError *error_ptr
 )
@@ -77,7 +77,7 @@
 }
 
 bool
-SBHostOS::ThreadJoin (lldb::thread_t thread, void **result, SBError *error_ptr)
+SBHostOS::ThreadJoin (lldb::thread_t thread, thread_result_t *result, SBError *error_ptr)
 {
     return Host::ThreadJoin (thread, result, error_ptr ? error_ptr->get() : NULL);
 }