debian: update debian/changelog and patches for 1.47.1~rc1-2 #96

Job	Run time
Build and test with ASAN enabled	1m 50s
Build and test with clang	1m 11s
Cross-compile for Android (aarch64)	27s
Build and test with gcc	54s
Cross-compile for Android (armv7a)	28s
Build and test with gcc -m32	1m 14s
Build and test on macOS	1m 16s
Cross-compile for Android (i686)	47s
Build and test with UBSAN enabled	1m 28s
Cross-compile for Android (x86_64)	28s
Build mke2fs on Windows with mingw32	2m 22s
Build mke2fs on Windows with mingw64	2m 21s
	14m 46s

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