Update toolchain path for cross-compiling

Fixes #1388

Author: 6by9

linux/kernel/building.md

@@ -101,7 +101,7 @@ source ~/.bashrc
 ```
 If you are on a 64-bit host system, you should use:
 ```bash
-echo PATH=\$PATH:~/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin >> ~/.bashrc
+echo PATH=\$PATH:~/tools/arm-bcm2708/arm-linux-gnueabihf/bin >> ~/.bashrc
 source ~/.bashrc
 ```
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