Add some preprocessor directives to allow compiling without V8.

fpdfsdk/src/fpdfview.cpp

Index: fpdfsdk/src/fpdfview.cpp
diff --git a/fpdfsdk/src/fpdfview.cpp b/fpdfsdk/src/fpdfview.cpp
index 0bf6426b66fb2e8aaac3bdb71188ec5aaa3f5e61..dc93fd38c0c74651aa241e2f96aa67ea8528cc52 100644
--- a/fpdfsdk/src/fpdfview.cpp
+++ b/fpdfsdk/src/fpdfview.cpp
@@ -14,7 +14,9 @@
 #include "../include/fsdk_define.h"
 #include "../include/fsdk_mgr.h"
 #include "../include/fsdk_rendercontext.h"
+#ifndef DISABLE_V8
 #include "../include/jsapi/fxjs_v8.h"
+#endif  // DISABLE_V8
 
 CPDF_CustomAccess::CPDF_CustomAccess(FPDF_FILEACCESS* pFileAccess) {
   if (pFileAccess)
@@ -110,10 +112,12 @@ DLLEXPORT void STDCALL FPDF_InitLibraryWithConfig(
     pModuleMgr->LoadEmbeddedCNS1CMaps();
     pModuleMgr->LoadEmbeddedKorea1CMaps();
   }
+#ifndef DISABLE_V8
   if (cfg && cfg->version >= 2) {
     FXJS_Initialize(cfg->m_v8EmbedderSlot,
                     reinterpret_cast<v8::Isolate*>(cfg->m_pIsolate));
   }
+#endif  // DISABLE_V8
 }
 
 DLLEXPORT void STDCALL FPDF_DestroyLibrary() {