try to isolate changes

Author: JerrySievert

.travis.yml

@@ -49,6 +49,11 @@ before_script:
 env:
   matrix:
     - PGVERSION=9.5 v8=4.4
+    - PGVERSION=9.5 v8=4.5
+    - PGVERSION=9.5 v8=4.6
+    - PGVERSION=9.5 v8=4.7
+    - PGVERSION=9.5 v8=4.8
+    - PGVERSION=9.5 v8=4.9
     - PGVERSION=9.5 v8=4.10
     - PGVERSION=9.4 v8=4.4
     - PGVERSION=9.4 v8=4.10

plv8.cc

@@ -284,7 +284,9 @@ _PG_init(void)
 	EmitWarningsOnPlaceholders("plv8");
 
 	V8::InitializeICU();
+#if V8_MAJOR_VERSION == 4 && V8_MINOR_VERSION >= 5
 	V8::InitializeExternalStartupData("plv8");
+#endif
 	Platform* platform = platform::CreateDefaultPlatform();
 	V8::InitializePlatform(platform);
 	V8::Initialize();