Fix Makefile dependencies for libcom_err

Fix Makefile dependencies for libcom_err

The e2fsprogs makefiles were using the same Makefile variable
LIBCOM_ERR for the link-line arguments as well as the dependencies.
Since LIBCOM_ERR can now include non-file arguments such as
"-lpthread", we need to use a separate DEPLIBCOM_ERR variable that
only has build file dependencies.

Do the same thing for STATIC_LIBCOM_ERR and PROFILED_LIBCOM_ERR.

Addresses-Sourceforge-Patches: #2813809

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