BaseTools: Fix checking for Sources section in INF file

BaseTools: Fix checking for Sources section in INF file

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1804

The check to see if [Sources] section lists all the header type
files of a module is missing the exclusion of source files that
fall under the scope of Package includes. This change adds the
exclusions.

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