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Add comment about incomplete types in README

This is a small desviation over the correct behaviour expected
for a compliant C89/90/11 compiler, so we have to document it
in the README file.

--- a/README

+++ b/README

@@ -63,3 +63,11 @@

 problems without this complexity (and they are the more usual

 way of writing such code).

+- Definition of variables with incomplete type

+  ---------------------------------------------

+

+C89 allows the definition of variables with incomplete type that

+have external linkage and file scope. The type of the variable

+is the composition of all the definitions find in the file. The exact

+rules are a bit complex (3.7.2), and SCC ignores  them at this moment

+and it does not allow any definition of variables with incomplete type.