Don't qualify #include in include/

Followup to https://codereview.chromium.org/2621983002/ so that
v8-version-string.h is includeable with varying include search paths.
This seems to match the pattern of other #includes in the include/
directory.

R=machenbach@chromium.org
BUG=chromium:581766

Review-Url: https://codereview.chromium.org/2634443002
Cr-Commit-Position: refs/heads/master@{#42337}

include/v8-version-string.h

@@ -5,7 +5,7 @@
 #ifndef V8_VERSION_STRING_H_
 #define V8_VERSION_STRING_H_
 
-#include "include/v8-version.h"
+#include "v8-version.h"  // NOLINT(build/include)
 
 // This is here rather than v8-version.h to keep that file simple and
 // machine-processable.