Fix references to moved polyglot.h header.

Author: rschatz

graalpython/com.oracle.graal.python.cext/hpy/hpy.c

@@ -39,7 +39,7 @@
  * SOFTWARE.
  */
 #include "hpy.h"
-#include <polyglot.h>
+#include <graalvm/llvm/polyglot.h>
 #include <truffle.h>
 
 #include <wchar.h>

graalpython/com.oracle.graal.python.cext/src/capi.h

@@ -44,7 +44,7 @@
 #define MUST_INLINE __attribute__((always_inline)) inline
 #define NO_INLINE __attribute__((noinline))
 
-#include <polyglot.h>
+#include <graalvm/llvm/polyglot.h>
 
 #include "Python.h"
 #include <truffle.h>