scripts/addToolVersion: cleanups

scripts/addToolVersion: correctly handle the libc categories

scrips/functions: fix downloads using curl

By default curl doesn't folow redirects. This breaks sourceforge downloads.
Add the -L option to curl to fix this.

Curl also downloads the html as a file even when it gets a 404. This breaks
http downloads when using the failback system. Add the -f option to curl to fix
this.

Signed-off-by: Richard Strand <richard.strand@icomera.com>

libc/glibc: correctly handle dual-bitness archs

If the selected ARCH is dual-bitness (eg. supports 32- and 64-bit),
then we need to know the correct place where to fetch some headers.
Currently, this applies only to x86 variants: i386 and x86_64.

scripts/functions: fix extraction

arch/alpha: cleanup Alpha code

config/arch: always select the adequate bitness

Even if the selected ARCH does not support different bitness (or we do
not support building with another bitness), still select the appropriate
bitness.

config/arch: also export bitness as a string

documentation: Remove refs to seemingly native toolchains issue

Remove references to the seemingly native toolchains do not build
issue as it seems to be fixed.

Signed-off-by: Richard Strand <richard.strand@icomera.com>

1.5: update version string to 1.5.3+hg