bring back accidentally-removed plugin

Author: kevinushey

R/plugin.R

@@ -0,0 +1,15 @@
+
+# Inline plugin used by sourceCpp.
+inlineCxxPlugin <- function() {
+   
+   list(
+      env = list(
+         PKG_CXXFLAGS = tbbCxxFlags(),
+         PKG_LIBS = tbbLdFlags()
+      ),
+      includes  = "#include <RcppParallel.h>",
+      LinkingTo = "RcppParallel",
+      body      = identity,
+      Depends   = "RcppParallel"
+   )
+}