[flang-rt] Fixes EXECUTE_COMMAND_LINE() status management and double buffering (#184285)
EXECUTE_COMMAND_LINE() without CMDSTAT initiated termination in runtime
if the command returned non-zero status code. For example,
EXECUTE_COMMAND_LINE('false') on Linux would cause "fatal Fortran
runtime error... : Command line execution failed with exit code: 1."
This is too strict: EXECUTE_COMMAND_LINE() successfully called 'false',
it's just 'false' happened to return non-zero status code. ifx and
gfortran don't initiate termination in such case. Changed
EXECUTE_COMMAND_LINE() implementation to behave in similar fashion.
Also during testing discovered that when the output of the program that
uses EXECUTE_COMMAND_LINE(... WAIT=.false.) is piped to a file, the
resulting file has duplicated output lines. This was because fork()
command also ends up duplicating parent's buffered output to the child.
Added flush of all units and C stdio before calling fork().
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