BaseTools: Fixed a incremental build bug

BaseTools: Fixed a incremental build bug

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2451

If removing a header file from source code and file
system, the incremental build will fail.

This patch is to fix this issue by setting each header file
as a target without any actions in makefile.

Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>