New Toolchain support by GCC_ARM for LPC824

Hello All
New adding two file.
LPC824.ld, startup_LPC824.s
Small modification two file.
system_LPC8xx.c, targets.py

Modification reason.

system_LPC8xx.c, result compile.

system_LPC8xx.c:341:21: warning: unused variable 'i' [-Wunused-variable]
[DEBUG] Output:    volatile uint32_t i;

This warning is solved by this code.

Please confirm that.
If you have any question please let me know.

Best regards,
Can you remove this uncommented variable definition as it was moved to the line 350. Thanks