debian: sort the symbol list for libext2fs2t64 #148

Job	Run time
Build and test with ASAN enabled	1m 45s
Build and test with clang	1m 9s
Cross-compile for Android (aarch64)	28s
Build and test with gcc	1m 1s
Cross-compile for Android (armv7a)	33s
Build and test with gcc -m32	1m 16s
Build and test on macOS	1m 15s
Cross-compile for Android (i686)	37s
Build and test with UBSAN enabled	1m 23s
Cross-compile for Android (x86_64)	32s
Build mke2fs on Windows with mingw32	2m 7s
Build mke2fs on Windows with mingw64	2m 8s
	14m 14s

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