math: Remove an extra semicolon in math function declarations

math: Remove an extra semicolon in math function declarations

Commit 6bc301672bfbd ("math: Remove __XXX math functions from installed
math.h [BZ #32418]") left an extra semicolon after macro expansion. For
instance the ceil declaration after expansion is:

  extern double ceil (double __x) __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__const__));;

This chokes very naive parsers like gauche c-wrapper. Fix that by
removing that extra semicolon in the macro.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>