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doc: Add ISO C99 reference in the README

There was a case where we had a reference to the ANSI standard
and since it is more common to reference the ISO document I
added it here.

--- a/README

+++ b/README

@@ -151,10 +151,11 @@

   ---------------------------------------------

 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 found in the file. The exact

-rules are a bit complex (3.7.2) so SCC ignores them at this moment

-by simply not allowing any definition of variables with incomplete type.

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

+composition of all the definitions found in the file. The exact rules

+are a bit complex (ANSI 3.7.2, or ISO C99 6.2.5p22) so SCC ignores them

+at this moment by simply not allowing any definition of variables with

+incomplete type.

 If you don't believe me try this code: