Missing support for decimal float suffixes

[Petr Pisar]

Hello,

I got report <https://bugzilla.redhat.com/show_bug.cgi?id=733051> that
indent-2.2.11 does break following code:

    double f = 3.0DF;

by producing:

    double f = 3.0 DF;

i.e. it does not recognize non-standard decimal float suffix "DF" and places
new white space before it.

The decimal float draft defines suffixes "DF", "DD", "DL", "df", "dd", and
"dl". See GCC info page "Decimal Floating Types" for more details.

-- Petr

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