FFTW single-precision library built

Until now, we were using the `--enable-single' configure-time option of
FFTW to build its single-precision library. The reason was that according
to the output of `./configure --help', this was equivalent to
`--enable-float'. However, the single precision library wasn't being built.
As a result, on systems that already had it, SExtractor would use the
system's library and on other systems, it would simply not pass the
configure step.

With this commit, we are now using `--enable-float' which fixes this
problem and installs the `libfftw3f*' libraries (showing that it is not
equal to `--enable-single'!). Also, some optimization flags were added to
hopefully make it faster.

This issue was found thanks to Zahra Sharbaf and Hamed Altafi.

This fixes bug #56588.

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