ld-version: Drop the 4th and 5th version components

ld-version: Drop the 4th and 5th version components

... making upstream development binutils snapshots work as expected,
e.g.:

$ mips64el-linux-ld --version
GNU ld (GNU Binutils) 2.20.1.20100303
[...]
$

Signed-off-by: Maciej W. Rozycki <[email protected]>
Acked-by: Michal Marek <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: James Hogan <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/12537/
Signed-off-by: Ralf Baechle <[email protected]>