Fixed uname() query on Solaris.

[roge]

Solaris returns "non-negative" result for uname() upon success.

See: http://www.unix.com/man-page/sunos/2/uname/

[roge]

I would like to mention this is necessary for OSInfo to work correctly on Solaris, during my testing the "non-negative" result uname() returned was 1 not 0.

[mkrautz]

I checked some of the other Unix-like systems, and OpenBSD's man page also specifies a non-negative return value on success, but the libc implementation only ever returns 0.

@roge- I'm OK with the ifdef, but could you add a comment documenting why it's needed in the code?

#ifdef Q_OS_SOLARIS
    // Solaris's uname returns a non-negative number on success...
    [...]
#else
    // ...while other Unix-like systems only use 0 on success.
    [...]
 #endif

[mkrautz]

Please add comments inside the ifdefs as suggested in my comment.

[mkrautz]

Merged, thanks! :-)