audio/lmms: Pass proper libdir to cmake

Thanks to Gabriel Magno for the report and fix.

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

audio/lmms/lmms.SlackBuild

@@ -7,7 +7,7 @@
 
 PRGNAM=lmms
 VERSION=${VERSION:-0.4.13}
-BUILD=${BUILD:-1}
+BUILD=${BUILD:-2}
 TAG=${TAG:-_SBo}
 
 if [ -z "$ARCH" ]; then
@@ -60,7 +60,7 @@ cd build
     -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
     -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
     -DCMAKE_INSTALL_PREFIX=/usr \
-    -DCMAKE_INSTALL_LIBDIR=/usr/lib${LIBDIRSUFFIX} \
+    -DCMAKE_INSTALL_LIBDIR=lib${LIBDIRSUFFIX} \
     ..
 
   make VERBOSE=1