[libstdc++-v3] Add pre-detected results for djgpp configure

[Benjamin Kosnik]

> +    AC_DEFINE(HAVE____BUILTIN_ABS)
> +    AC_DEFINE(HAVE____BUILTIN_FABSF)
> +    AC_DEFINE(HAVE____BUILTIN_FABS)
> +    AC_DEFINE(HAVE____BUILTIN_FABSL)
> +    AC_DEFINE(HAVE____BUILTIN_LABS)
> +    AC_DEFINE(HAVE____BUILTIN_SQRTF)
> +    AC_DEFINE(HAVE____BUILTIN_SQRT)
> +    AC_DEFINE(HAVE____BUILTIN_SQRTL)
> +    AC_DEFINE(HAVE____BUILTIN_SINF)
> +    AC_DEFINE(HAVE____BUILTIN_SIN)
> +    AC_DEFINE(HAVE____BUILTIN_SINL)
> +    AC_DEFINE(HAVE____BUILTIN_COSF)
> +    AC_DEFINE(HAVE____BUILTIN_COS)
> +    AC_DEFINE(HAVE____BUILTIN_COSL)

autoreconf now fails with:



%autoreconf
autoheader: warning: missing template: HAVE____BUILTIN_ABS
autoheader: Use AC_DEFINE([HAVE____BUILTIN_ABS], [], [Description])
autoheader: warning: missing template: HAVE____BUILTIN_COS
autoheader: warning: missing template: HAVE____BUILTIN_COSF
autoheader: warning: missing template: HAVE____BUILTIN_COSL
autoheader: warning: missing template: HAVE____BUILTIN_FABS
autoheader: warning: missing template: HAVE____BUILTIN_FABSF
autoheader: warning: missing template: HAVE____BUILTIN_FABSL
autoheader: warning: missing template: HAVE____BUILTIN_LABS
autoheader: warning: missing template: HAVE____BUILTIN_SIN
autoheader: warning: missing template: HAVE____BUILTIN_SINF
autoheader: warning: missing template: HAVE____BUILTIN_SINL
autoheader: warning: missing template: HAVE____BUILTIN_SQRT
autoheader: warning: missing template: HAVE____BUILTIN_SQRTF
autoheader: warning: missing template: HAVE____BUILTIN_SQRTL
autoreconf: /usr/bin/autoheader failed with exit status: 1


please fix.

best,
benjamin