make: 4.2 -> 4.2.1

1) Remove unused patch 0001-main.c-main-SV-43434-Handle-NULL-returns-from-ttynam.patch.

2) Here are the fixes since 4.2, the [SV 47995] is important for us.
   * maintMakefile: TP recommends rsync for retrieving PO files.
   * main.c (main): [SV 48009] Reset stack limit for make re-exec.
   [SV 47995] Ensure forced double-colon rules work with -j.
   * DELETE_ON_ERROR: [SV 48061] Use "exit 1" for portability.
   * w32/pathstuff.c: [SV 47996] Use ISBLANK() not isblank().
   Fix printing time stamps on MS-Windows
   [SV 48037] Fix MinGW build with Posix configury tools

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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