feat: Added CC option to kconfig

kernel/GNUmakefile

@@ -15,8 +15,8 @@ ifneq ("$(wildcard $(CONFIG))","")
     include $(CONFIG)
 endif
 
-CC := gcc
-AS := gcc
+CC := $(CONFIG_CC)
+AS := $(CC)
 NASM := nasm
 
 ifeq ($(BUILD_MODE),)

kernel/Kconfig

@@ -31,3 +31,9 @@ config ENABLE_FLANTERM
     bool "Enable Flanterm Support"
     help
       Includes support for the Flanterm terminal emulator. Useful for debugging real hardware.
+
+config CC
+    string "C Compiler"
+    default "gcc"
+    help
+      Path to the C compiler to use for building.