libraries/OpenAL: Set build type to release.

Signed-off-by: Matteo Bernardini <ponce@slackbuilds.org>

libraries/OpenAL/OpenAL.SlackBuild

@@ -25,7 +25,7 @@
 PRGNAM=OpenAL
 SRCNAM=openal-soft
 VERSION=1.13
-BUILD=${BUILD:-1}
+BUILD=${BUILD:-2}
 TAG=${TAG:-_SBo}
 
 if [ -z "$ARCH" ]; then
@@ -70,6 +70,7 @@ cmake \
   -DCMAKE_C_FLAGS="$SLKCFLAGS" \
   -DCMAKE_INSTALL_PREFIX=/usr \
   -DCMAKE_VERBOSE_MAKEFILE:BOOL="on" \
+  -DCMAKE_BUILD_TYPE=Release \
   -DLIB_SUFFIX=${LIBDIRSUFFIX}
 
 make