Support having "srcs" from other packages in tflite_cc_library_with_c_headers_test
Support having "srcs" from other packages in tflite_cc_library_with_c_headers_test
and in cc_library_with_tflite_with_c_headers_test.

This avoids a build error when invoking those macros with multiple
"srcs" with different package names but the same unqualified target
name.
