libuv: Include uv/ headers from each other without any path

Headers in `uv/` can include each other without the `uv/` prefix.  Using
the prefix assumes that the location of `uv/` is in the include file
search path, but it is possible to include `uv.h` via a longer path.

Utilities/cmlibuv/include/uv/unix.h

@@ -42,32 +42,32 @@
 #include <pthread.h>
 #include <signal.h>
 
-#include "uv/threadpool.h"
+#include "threadpool.h"
 
 #ifdef CMAKE_BOOTSTRAP
-# include "uv/posix.h"
+# include "posix.h"
 #elif defined(__linux__)
-# include "uv/linux.h"
+# include "linux.h"
 #elif defined (__MVS__)
-# include "uv/os390.h"
+# include "os390.h"
 #elif defined(__PASE__)
-# include "uv/posix.h"
+# include "posix.h"
 #elif defined(_AIX)
-# include "uv/aix.h"
+# include "aix.h"
 #elif defined(__sun)
-# include "uv/sunos.h"
+# include "sunos.h"
 #elif defined(__APPLE__)
-# include "uv/darwin.h"
+# include "darwin.h"
 #elif defined(__DragonFly__)       || \
       defined(__FreeBSD__)         || \
       defined(__FreeBSD_kernel__)  || \
       defined(__OpenBSD__)         || \
       defined(__NetBSD__)
-# include "uv/bsd.h"
+# include "bsd.h"
 #elif defined(__CYGWIN__) || defined(__MSYS__)
-# include "uv/posix.h"
+# include "posix.h"
 #elif defined(__GNU__)
-# include "uv/posix.h"
+# include "posix.h"
 #endif
 
 #ifndef NI_MAXHOST

Utilities/cmlibuv/include/uv/win.h

@@ -54,13 +54,13 @@ typedef struct pollfd {
 #include <sys/stat.h>
 
 #if defined(_MSC_VER) && _MSC_VER < 1600
-# include "uv/stdint-msvc2008.h"
+# include "stdint-msvc2008.h"
 #else
 # include <stdint.h>
 #endif
 
-#include "uv/tree.h"
-#include "uv/threadpool.h"
+#include "tree.h"
+#include "threadpool.h"
 
 #define MAX_PIPENAME_LEN 256