Revert "libgcc: gthr: support for --enable-threads=c11
" until compatibility issue is resolved
#30
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This series reverts the support for C11 threads-based gthread implementation introduced in #27 because it breaks non-multithreaded C++ applications and requires the introduction of special C11 threads stub functions on the Zephyr side, which creates an incompatibility between the latest Zephyr SDK release and earlier Zephyr releases.
The patch should be reworked to provide the weak stub implementations of the C11 threads functions within libgcc, as described in zephyrproject-rtos/sdk-ng#751 (comment), to ensure that it does not break compatibility with the prior Zephyr releases.