dumpe2fs: add support for LABEL= and UUID= specifiers for the device #139

Job	Run time
Build and test with clang	1m 16s
Build and test with gcc	55s
Cross-compile for Android (aarch64)	32s
Build and test with ASAN enabled	1m 38s
Cross-compile for Android (armv7a)	46s
Build and test with gcc -m32	1m 16s
Cross-compile for Android (i686)	27s
Build and test on macOS	1m 34s
Build and test with UBSAN enabled	1m 21s
Cross-compile for Android (x86_64)	36s
Build mke2fs on Windows with mingw32	1m 51s
Build mke2fs on Windows with mingw64	2m 14s
	14m 26s

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