m4-1.4.11 test fails on HPPA

[Luca Lesinigo]

Using m4-1.4.11,

test-strtod.c:667: assertion failed
test-strtod.c:668: assertion failed
test-strtod.c:688: assertion failed
test-strtod.c:717: assertion failed
test-strtod.c:718: assertion failed
FAIL: test-strtod

I found the problem with m4 from Gentoo Portage and confirmed it  
with ./configure - make - make check in the sources from the original  
m4-1.4.11 tarball, compiling -O2 or -O0 doesn't change anything.

Confirmed on an HPPA 2.0 with:
- gentoo's gcc-4.1.2 and glibc-2.7-r2
- gentoo's gcc-4.2.4 and glibc-2.7-r2
but all checks are successful on HPPA 2.0 with:
- gentoo's gcc-4.3.1 and glibc-2.8_p20080602

I tried also on an x86_64 box with gcc-3.4.6 and glibc-2.6.1 and all  
checks are successful.

I'm not 100% sure if this is a problem in m4 or somewhere else. Feel  
free to mail me if you need any other test or if you have suggestions.

--
Luca Lesinigo