system/pdksh: Misc automated cleanups.

Signed-off-by: David Somero <xgizzmo@slackbuilds.org>

system/pdksh/pdksh.SlackBuild

@@ -29,10 +29,19 @@
 
 PRGNAM=pdksh
 VERSION=5.2.14
-ARCH=${ARCH:-i486}
 BUILD=${BUILD:-4}
 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
@@ -47,6 +56,9 @@ elif [ "$ARCH" == "i686" ]; then
 elif [ "${ARCH}" == "x86_64" ];then
   SLKCFLAGS='-O2 -fPIC'
   LIBDIRSUFFIX="64"
+else
+  SLKCFLAGS="-O2"
+  LIBDIRSUFFIX=""
 fi
 
 set -e