feat ✨: Enhance compiler settings with Z-Stack SDK path spec and optimization level adjustments

- The main goal of the changes is to enhance the compiler settings by adding path specifications for the Z-Stack SDK and adjust optimization levels.

Makefile

@@ -1,6 +1,15 @@
+# Path to Z-Stack SDK
+ZSTACK_DIR = ./include
+
+# Include path for the Z-Stack SDK
+# INCLUDE_DIRS = -I$(ZSTACK_DIR)/Components/hal/CC2530 \
+#                -I$(ZSTACK_DIR)/Components/zigbee
+INCLUDE_DIRS = -I$(ZSTACK_DIR)
+
 # Compiler settings
 CC = msp430-elf-gcc	# MSP430 compiler
-CFLAGS = -Wall -Os	# Enable all warnings, Optimize for size
+# CFLAGS (C Compiler flags)
+CFLAGS = $(INCLUDE_DIRS) -Wall -O2	# Enable all warnings, Optimize for size
 LDFLAGS =
 LIBS = -lZStack -lhal	# ZStack for Zigbee communication, lhal for Hardware Abstraction Layer library