Add missing Make dependencies

[StefanosChaliasos]

Hello

This pull request fixes the build script of this project.
Specifically, it adds missing Make dependencies so that the targets of the project are re-generated correctly whenever there are updates to any of the dependent source files.

In this way, the project is incrementally built and we no longer sacrifice time in clean builds (i.e., builds after a make clean).

Note that this fix follows the best practices for tracking dependencies automatically (through gcc -MD)

For more details, see here.
https://www.gnu.org/software/make/manual/html_node/Automatic-Prerequisites.html

[e-n-f]

I'm not sure I understand the intent of this change, because the existing -MMD in the Makefile should already be generating the dependencies. Is there a reason to prefer -MD?

[StefanosChaliasos]

Hello, You're right. -MD is not needed, but the problem is that with the previous Makefile, no dependency files were generated for Objects at line 49.