debian: sort the symbol list for libext2fs2t64 #149

Job	Run time
Build and test with ASAN enabled	1m 36s
Build and test with clang	1m 19s
Cross-compile for Android (aarch64)	37s
Build and test with gcc	57s
Cross-compile for Android (armv7a)	37s
Build and test with gcc -m32	1m 33s
Build and test on macOS	1m 12s
Cross-compile for Android (i686)	34s
Build and test with UBSAN enabled	1m 27s
Cross-compile for Android (x86_64)	41s
Build mke2fs on Windows with mingw32	2m 0s
Build mke2fs on Windows with mingw64	2m 6s
	14m 39s

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