[Bug driver/103398] New: configure: Enable --enable-default-pie by default for Linux

[i at maskray dot me via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103398

            Bug ID: 103398
           Summary: configure: Enable --enable-default-pie by default for
                    Linux
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
          Assignee: unassigned at gcc dot gnu.org
          Reporter: i at maskray dot me
  Target Milestone: ---

Many Linux distros configure GCC with --enable-default-pie (at least
Arch/Debian/Fedora/Gentoo/Ubuntu). I think it makes sense to default to
--enable-default-pie for Linux.