Fix: deallocate in metapackage_t destroy() (#1192)

Author: perazz

src/metapackage/fpm_meta_base.f90

@@ -91,6 +91,7 @@ elemental subroutine destroy(this)
         if (allocated(this%link_libs)) deallocate(this%link_libs)
         if (allocated(this%incl_dirs)) deallocate(this%incl_dirs)
         if (allocated(this%external_modules)) deallocate(this%external_modules)
+        if (allocated(this%dependency)) deallocate(this%dependency) 
     end subroutine destroy
 
     !> Resolve metapackage dependencies into the command line settings