Remove unused header (#406)

MichaelChirico · web-flow · commit 2ffd1bdea3f1 · 2023-10-30T13:30:20.000-05:00
diff --git a/src/init.c b/src/init.c
@@ -2,7 +2,6 @@
 #include <Rinternals.h>
 #undef R_NO_REMAP
 
-#include <R.h>
 #include <stdlib.h> // for NULL
 #include <R_ext/Rdynload.h>
 
