Make GC_parallel a synonym to GC_markers_m1

* include/gc.h (GC_parallel, GC_enable_incremental): Update comment.
* include/private/gc_priv.h (GC_markers_m1): Define as a synonym
(macro) to GC_parallel instead of declaring a global variable (only
if PARALLEL_MARKER); update the comment.
* mark.c (GC_markers_m1): Remove global variable.
* pthread_support.c (start_mark_threads): Remove unnecessary
GC_parallel zeroing (after setting GC_markers_m1 to 0).
* win32_threads.c (start_mark_threads): Likewise.
* pthread_support.c (GC_fork_child_proc, GC_thr_init): Remove
unnecessary GC_markers_m1 zeroing (after setting GC_parallel to FALSE).
* win32_threads.c (GC_thr_init): Likewise.
* pthread_support.c (GC_thr_init): Set GC_parallel to FALSE instead of
zeroing GC_markers_m1; remove GC_parallel assignment to TRUE (since
GC_markers_m1 is set to non-zero value); add the comment.
* pthread_support.c (GC_thr_init): Set GC_parallel to FALSE instead of
zeroing GC_markers_m1; add the comment.
* pthread_support.c (GC_thr_init): Remove GC_parallel assignment to
TRUE (since GC_markers_m1 is set to non-zero value).
* win32_threads.c (GC_thr_init): Likewise.

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