Disable stripping pcc tool.

We don't have a tool that strips tools -- we have only a tool that
strips target programs. $TOOLDIR/bin/$PLATFORM-install supports -s
by invoking the target-stripping to

Disable stripping pcc tool.

We don't have a tool that strips tools -- we have only a tool that
strips target programs. $TOOLDIR/bin/$PLATFORM-install supports -s
by invoking the target-stripping tool, which chokes if you try to use
it to strip tools on a sufficiently different cross build. So let's
just not strip the pcc tool -- it's tiny enough that I'm not worried
about its unstripped size!

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because we use --sysroot, force the default paths to be normal

while here, enable tls support

Build pcc as host tool if requested.