[U-Boot] [2011.09-rc2] Fix for compile error with gcc3

[rhabarber1848]

Hi,

compiling U-Boot 2011.09-rc2 with gcc-3.4.6 fails with this error:

In file included from u-boot-2011.09-rc2/include/linux/compiler.h:40,
                 from serial.c:29:
u-boot-2011.09-rc2/include/linux/compiler-gcc.h:87:30: linux/compiler-gcc3.h: No
such file or directory

Adding compiler-gcc3.h from Linux kernel source to
u-boot-2011.09-rc2/include/linux/ fixes this gcc3-only problem.

Kind regards, rhabarber1848