libext2fs: Compile ext2fs_swab64() for all platforms

Although nothing uses ext2fs_swab64() yet, debian's dpkg-gensymbols
picked up the fact that ext2fs_swab64() isn't getting defined on
non-x86 platforms.  Oops.  This patch moves the definition of
ext2fs_swab64() to a place where it will be compiled for all
architectures.

Addresses-Debian-Bug: #497515

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
1 file changed