[System.Information] Use Marshal.FreeHGlobal() instead of Libc.Free()

[System.Information] Use Marshal.FreeHGlobal() instead of Libc.Free()

Use Marshal.FreeHGlobal() instead of Libc.Free() for ASAN
environment. Also, remove not any more used Libc.Free() Interop.

In ASAN environment, because Interop uses dlopen(), newly opended
libc causes different libc/asan alloc context from already allocaed
buffer, and it gives segment fault crash when calling Libc.Free().

Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>