tests/floating_point_test.tpl : Reduce tolerance of a couple of tests.
tests/floating_point_test.tpl : Reduce tolerance of a couple of tests.

A couple of tests were failing when compiled with gcc-4.8 (and
gcc-snapshot/4.9.0 from Debian). The tests changed were for 32 bit
ALAC (test result changed from -186 to -181 dB signal-to-noise) and
for doubles (test results changed from -300 to -205 dB signal-to-noise).

greearb/libsndfile-ct,Icenowy/libsndfile,RonNovy/libsndfile,Icenowy/libsndfile,syb0rg/libsndfile,evpobr/libsndfile,Icenowy/libsndfile,syb0rg/libsndfile,erikd/libsndfile,libsndfile/libsndfile,erikd/libsndfile,erikd/libsndfile,RonNovy/libsndfile,syb0rg/libsndfile,audiokit/libsndfile,evpobr/libsndfile,greearb/libsndfile-ct,greearb/libsndfile-ct,libsndfile/libsndfile,syb0rg/libsndfile,evpobr/libsndfile,audiokit/libsndfile,greearb/libsndfile-ct,libsndfile/libsndfile,greearb/libsndfile-ct,evpobr/libsndfile,Icenowy/libsndfile,libsndfile/libsndfile,Icenowy/libsndfile,RonNovy/libsndfile,audiokit/libsndfile,erikd/libsndfile,libsndfile/libsndfile,RonNovy/libsndfile,audiokit/libsndfile,evpobr/libsndfile,erikd/libsndfile