libusbg: Surround header with include guards.
libusbg: Surround header with include guards.

Surround header with include guards to protect against
multiple inclusion.

Signed-off-by: Krzysztof Opasiak <8064eda6f94b3817252b7d7649cf754592f63500@samsung.com>

pszewczyk/libusbg,pszewczyk/libusbg