misc/cksfv: miscellaneous cleanups

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

misc/cksfv/cksfv.SlackBuild

@@ -31,9 +31,19 @@
 
 PRGNAM=cksfv
 VERSION=1.3.14
-ARCH=${ARCH:-i486}
 BUILD=${BUILD:-1}
 TAG=${TAG:-_SBo}
+
+# Automatically determine the architecture we're building on:
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i486 ;;
+    arm*) ARCH=arm ;;
+    # Unless $ARCH is already set, use uname -m for all other archs:
+       *) ARCH=$( uname -m ) ;;
+  esac
+fi
+
 CWD=$(pwd)
 TMP=${TMP:-/tmp/SBo}
 PKG=$TMP/package-$PRGNAM
@@ -45,6 +55,8 @@ elif [ "$ARCH" = "i686" ]; then
   SLKCFLAGS="-O2 -march=i686 -mtune=i686"
 elif [ "$ARCH" = "x86_64" ]; then
   SLKCFLAGS="-O2 -fPIC"
+else
+  SLKCFLAGS="-O2"
 fi
 
 set -e