audio/SuperCollider: Fixed build on i?86.

Compiling with ARCH=i486 gives "undefined reference to
`boost::atomics::detail::lockpool::pool_'". It builds ok with
i686.

Signed-off-by: David Spencer <idlemoor@slackbuilds.org>

audio/SuperCollider/SuperCollider.SlackBuild

@@ -12,9 +12,7 @@ TAG=${TAG:-_SBo}
 
 if [ -z "$ARCH" ]; then
   case "$( uname -m )" in
-    i486) ARCH=i486 ;;
-    i586) ARCH=i586 ;;
-    i686) ARCH=i686 ;;
+    i?86) ARCH=i686 ;;
     arm*) ARCH=arm ;;
        *) ARCH=$( uname -m ) ;;
   esac
@@ -84,7 +82,7 @@ mkdir -p build
 cd build
   cmake \
     -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
-	  -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
+    -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
     -DCMAKE_INSTALL_PREFIX=/usr \
     -DNO_AVAHI="$avahi" \
     -DSC_WII="$cwiid" \