[dcl.type.general] Strike irrelevant footnote (#8578)

The reference to the "implicit int" rule in C has been out-dated for a long time.

Author: AlisdairM

source/declarations.tex

@@ -1232,13 +1232,6 @@
 \grammarterm{cv-qualifier} shall appear in a complete
 \grammarterm{type-specifier-seq} or a complete
 \grammarterm{decl-specifier-seq}.
-\begin{footnote}
-There is no special
-provision for a \grammarterm{decl-specifier-seq} that
-lacks a \grammarterm{type-specifier} or that has a
-\grammarterm{type-specifier} that only specifies \grammarterm{cv-qualifier}{s}.
-The ``implicit int'' rule of C is no longer supported.
-\end{footnote}
 
 \pnum
 \begin{note}