add --enable-host-bind-now, use it (#2044917)

use _thread_db_sizeof_pthread to obtain struct pthread size (#2034494)
add --enable-host-pie, build the compilers as PIE (#2044917)

add support for relocation of the PCH data (pch/71934, #2044917)
remove 30_threads/future/members/poll.cc (#2050090)
avoid overly-greedy match in dejagnu regexp (#2050089)

don't set -Wl,-rpath when building annobin (#2047356)

update from releases/gcc-11-branch (#2047296)
PRs fortran/104127, fortran/104212, fortran/104227, target/101529
fix up va-opt-6.c testcase

update from releases/gcc-11-branch (#2047296)
PRs ada/103538, analyzer/101962, bootstrap/103688, c++/85846, c++/95009,
end/101751, middle-end/102860, middle-end/103813, objc/103639,
optimization/102478,
optimization/103837, rtl-optimization/103860,
optimization/103908, sanitizer/102911, target/102347,
optimization/101615, tree-optimization/103523,
optimization/103603, tree-optimization/103995

do not undefine _hardened_build (#2044917)

update annobin plugin patch (#2030667)

update annobin plugin patch (#2030667)

update annobin plugin patch (#2030667)

fix dg-ice tests (#1996047)

update annobin plugin patch (#2030667)

build annobin plugin (patch by Nick Clifton) (#2030667)

update from releases/gcc-11-branch (#1996858)
PRs ada/100486, c++/70796, c++/92746, c++/93286, c++/94490, c++/102642,
profile/100520, ipa/102714,
end/64888,
end/101480, middle-end/102431, middle-end/102518,
end/103059, middle-end/103181, middle-end/103248,
end/103384, preprocessor/103130, rtl-optimization/102356,
optimization/102842, target/101985, target/102976, target/102991,
optimization/100393, tree-optimization/102139,
optimization/102505, tree-optimization/102572,
optimization/102788, tree-optimization/102789,
optimization/102798, tree-optimization/102970,
optimization/103192, tree-optimization/103204,
optimization/103237, tree-optimization/103255,
optimization/103435
fix up #__VA_OPT__ handling (PR preprocessor/103415)

add -Wbidi-chars patch (#2008393)

update from releases/gcc-11-branch (#1996858)
build target shared libraries with -Wl,-z,relro,-z,now
add mwaitintrin.h on x86 (#2013860)
improve generated code with extern thread_local constinit vars
add support for C++20 #__VA_OPT__
add bundled(libbacktrace) and bundled(libffi) provides (#1993932)