build-sys: add two makefile symlinks

diff --git a/hwdb/Makefile b/hwdb/Makefile
new file mode 120000 (symlink)
index 0000000..bd10475
--- /dev/null
+++ b/hwdb/Makefile
@@ -0,0 +1 @@
+../src/Makefile
\ No newline at end of file

diff --git a/src/gpt-auto-generator/Makefile b/src/gpt-auto-generator/Makefile
new file mode 120000 (symlink)
index 0000000..d0b0e8e
--- /dev/null
+++ b/src/gpt-auto-generator/Makefile
@@ -0,0 +1 @@
+../Makefile
\ No newline at end of file