[FFmpeg-devel] Make libavfilter/vf_drawtext.c build under uclibc environments

[René Rhéaume]

In function func_eval_expr_int_format inside
libavfilter/vf_drawtext.c, the functions feclearexcept and
fetestexcept are used. They are missing on uclibc. On that platform,
instead of checking if the FPU raised an exception after trying to
convert a floating-point number to an integer, do the check beforehand
using isfinite and comparisons against the maximum and minimum value
of an int32_t.

Signed-off-by: René Rhéaume <rene.rheaume at gmail.com>
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