academic/xcircuit: Misc automated cleanups.

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

academic/xcircuit/xcircuit.SlackBuild

@@ -7,10 +7,19 @@
 
 PRGNAM=xcircuit
 VERSION=3.7.6
-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
@@ -25,6 +34,9 @@ elif [ "$ARCH" = "i686" ]; then
 elif [ "$ARCH" = "x86_64" ]; then
     SLKCFLAGS="-O2 -fPIC"
     LIBDIRSUFFIX="64"
+else
+  SLKCFLAGS="-O2"
+  LIBDIRSUFFIX=""
 fi
 
 set -e