tools/build: use separate tmp dirs for kernel and system builds (#65)

Allows both builds to run in parallel without clobbering each other.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: greatgitsby

tools/build/build_kernel.sh

@@ -7,7 +7,7 @@ cd "$DIR"
 TOOLS="$DIR/tools/bin"
 KERNEL_DIR="$DIR/kernel/linux"
 PATCHES_DIR="$DIR/kernel/patches"
-TMP_DIR="$DIR/build/tmp"
+TMP_DIR="$DIR/build/tmp-kernel"
 OUT_DIR="$DIR/build"
 BOOT_IMG=./boot.img
 

tools/build/build_system.sh

@@ -10,7 +10,7 @@ cd "$DIR"
 
 DOWNLOADS_DIR="$DIR/build/downloads"
 VOID_ROOTFS_FILE="$DOWNLOADS_DIR/void-aarch64-ROOTFS-20250202.tar.xz"
-BUILD_DIR="$DIR/build/tmp"
+BUILD_DIR="$DIR/build/tmp-system"
 OUTPUT_DIR="$DIR/build"
 
 ROOTFS_DIR="$BUILD_DIR/void-rootfs"