iucode_tool: add missing limits.h for USE_CPUID_DEVICE with musl

If USE_CPUID_DEVICE is enabled, compilation fails for missing define using musl libc as it doesn't include limits.h header by default. Add the missing include to fix compilation error with USE_CPUID_DEVICE define and musl libc.

Signed-off-by: Christian Marangi ansuelsmth@gmail.com