libraries/msgpack-c: Fixed PRGNAM in build script.

Signed-off-by: B. Watson <yalhcru@gmail.com>

Signed-off-by: Robby Workman <rworkman@slackbuilds.org>

libraries/msgpack-c/msgpack-c.SlackBuild

@@ -22,12 +22,13 @@
 #  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 #  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-SRCNAM=msgpack
-PRGNAM=$SRCNAM-c
+PRGNAM=msgpack-c
 VERSION=${VERSION:-3.2.1}
 BUILD=${BUILD:-1}
 TAG=${TAG:-_SBo}
 
+SRCNAM=msgpack
+
 if [ -z "$ARCH" ]; then
   case "$( uname -m )" in
     i?86) ARCH=i586 ;;