Bug#677972: cpl: fftw not found on ia64, s390x

[Ole Streicher]

Source: cpl
Version: 6.1.1-1

On ia64 and s390x, fftw is not detected during configure. Therefore the
FFTW part is not available on these platforms.

"configure" reports:

[...]
checking for libwcs... libraries /usr/lib/ia64-linux-gnu, headers
/usr/include
checking for a libwcs version >= 4.4.4... 4.13.4
checking for fftw (normal-precision)... libraries
/usr/lib/ia64-linux-gnu, headers /usr/include
checking for a fftw (normal-precision) version >= 3.1.2... no
configure: WARNING: Installed normal-precision fftw (4.13.4) is too old
checking for fftw (single-precision)... libraries
/usr/lib/ia64-linux-gnu, headers /usr/include
checking for a fftw (single-precision) version >= 3.1.2... no
configure: WARNING: Installed single-precision fftw (4.13.4) is too old!
checking for ANSI C header files... (cached) yes
[...]

See

https://buildd.debian.org/status/fetch.php?pkg=cpl&arch=ia64&ver=6.1.1-1&stamp=1339961198
https://buildd.debian.org/status/fetch.php?pkg=cpl&arch=s390x&ver=6.1.1-1&stamp=1339958508

for full build logs. It is still unclear whether this is a problem with
the fftw installation on these platforms, or a bug in the configure
script of cpl.