Fix system-nspr-prtime patch to match Fedora paths

The clean way to do this would probably be to call pkg-config or
nspr-config to get a -I flag and use just #include <prtime.h>, but this
should work for now.

qtwebengine-opensource-src-5.6.0-beta-system-nspr-prtime.patch

@@ -30,7 +30,7 @@ diff -ur qtwebengine-opensource-src-5.6.0-beta/src/3rdparty/chromium/base/time/p
  
  #include "base/compiler_specific.h"
 -#include "base/third_party/nspr/prtime.h"
-+#include <nspr/prtime.h>
++#include <nspr4/prtime.h>
  #include "base/time/time.h"
  #include "testing/gtest/include/gtest/gtest.h"
  
@@ -43,7 +43,7 @@ diff -ur qtwebengine-opensource-src-5.6.0-beta/src/3rdparty/chromium/base/time/t
  #include "base/strings/stringprintf.h"
 -#include "base/third_party/nspr/prtime.h"
 +
-+#include <nspr/prtime.h>
++#include <nspr4/prtime.h>
  
  namespace base {