libstatgrab: Update to version 0.92.1

libstatgrab: Update to version 0.92.1

- Update from vesrion 0.92 to 0.92.1
- Update of rootfile
- Changelog
    libstatgrab 0.92.1 (27 July 2021)
	 * Fix build with autoconf 2.70+.
	 * Fix CPU stats on older Linux kernels.
	 * Make sure to count processes in an unknown state.
	 * Check if -ltinfo is needed when linking ncurses.
	 * Fixes to build when cross-compiling.
	 * Fix build with -DNDEBUG.
	 * Handle vmmeter changes in FreeBSD 12.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>