system/posixovl: Fix shebang.

Signed-off-by: B. Watson <yalhcru@gmail.com>
Signed-off-by: David Spencer <idlemoor@slackbuilds.org>

system/posixovl/posixovl.SlackBuild

@@ -1,4 +1,4 @@
-#!/bin/sh -e
+#!/bin/sh
 #
 # Slackware build script for posixovl
 #
@@ -22,6 +22,8 @@
 #  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 #  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+set -e
+
 PRGNAM=posixovl
 VERSION=${VERSION:-1.2}
 BUILD=${BUILD:-1}