build: fix `make install` when --disable-shared is used

When --disable-shared is used, there are no .so files to install, and
the argument order for install would get messed up.

Reported-by: Michael Teicher <mteicher@gmail.com>
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
1 file changed