Cleans up some POSIX header bits in H5private.h (#783)

src/H5private.h

@@ -26,21 +26,6 @@
 
 #include "H5public.h" /* Include Public Definitions    */
 
-/* include the pthread header */
-#ifdef H5_HAVE_THREADSAFE
-#ifdef H5_HAVE_WIN32_API
-#ifndef H5_HAVE_WIN_THREADS
-#ifdef H5_HAVE_PTHREAD_H
-#include <pthread.h>
-#endif /* H5_HAVE_PTHREAD_H */
-#endif /* H5_HAVE_WIN_THREADS */
-#else  /* H5_HAVE_WIN32_API */
-#ifdef H5_HAVE_PTHREAD_H
-#include <pthread.h>
-#endif /* H5_HAVE_PTHREAD_H */
-#endif /* H5_HAVE_WIN32_API */
-#endif /* H5_HAVE_THREADSAFE */
-
 #include <assert.h>
 #include <ctype.h>
 #include <errno.h>
@@ -49,29 +34,28 @@
 #include <limits.h>
 #include <math.h>
 #include <signal.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
-/*
- * If _POSIX_VERSION is defined in unistd.h then this system is Posix.1
- * compliant. Otherwise all bets are off.
- */
+/* POSIX headers */
 #ifdef H5_HAVE_UNISTD_H
-#include <sys/types.h>
+#include <pwd.h>
 #include <unistd.h>
-#endif
-#ifdef _POSIX_VERSION
+#include <sys/types.h>
 #include <sys/wait.h>
-#include <pwd.h>
 #endif
 
-#include <stdint.h>
+/* Include the Pthreads header, if necessary */
+#if defined(H5_HAVE_THREADSAFE) && defined(H5_HAVE_PTHREAD_H)
+#include <pthread.h>
+#endif
 
 /*
- * The `struct stat' data type for stat() and fstat(). This is a Posix file
- * but often apears on non-Posix systems also.  The `struct stat' is required
- * for hdf5 to compile, although only a few fields are actually used.
+ * The `struct stat' data type for stat() and fstat(). This is a POSIX file
+ * but often apears on non-POSIX systems also.  The `struct stat' is required
+ * for HDF5 to compile, although only a few fields are actually used.
  */
 #ifdef H5_HAVE_SYS_STAT_H
 #include <sys/stat.h>