replace echo with printf for portable color output in Makefile

[Yin-SHT]

Description

This PR fixes a portability issue with the Makefile that causes ANSI color codes to be displayed as raw text instead of colored output on various systems.

Problem

The current Makefile uses echo to display colored build messages with ANSI escape sequences. However, echo's handling of escape sequences is inconsistent across different shells and platforms. On my system, the build output shows raw escape codes.

Solution

Replaced all echo commands with printf, which consistently interprets escape sequences across all POSIX-compliant systems:

# Before
@echo "  \033[1;32mCC\033[0m $@"

# After  
@printf "  \033[1;32mCC\033[0m $@\n"