Added a types.h with vim.h unsigned int typedefs.

src/types.h

@@ -0,0 +1,20 @@
+/* vi:set ts=8 sts=4 sw=4:
+ *
+ * VIM - Vi IMproved	by Bram Moolenaar
+ *
+ * Do ":help uganda"  in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ */
+
+#ifndef NEOVIM_TYPES_H
+#define NEOVIM_TYPES_H
+
+/*
+ * Shorthand for unsigned variables. Many systems, but not all, have u_char
+ * already defined, so we use char_u to avoid trouble.
+ */
+typedef unsigned char char_u;
+typedef unsigned short short_u;
+typedef unsigned int int_u;
+
+#endif /* NEOVIM_TYPES_H */