system/qemu-kvm: Enabled (optional) spice support.

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

system/qemu-kvm/README

@@ -21,3 +21,5 @@ different group, then run the SlackBuild like this:
 
 Don't forget to load the 'kvm-intel' or 'kvm-amd' module (depending on 
 your processor) prior to running 'qemu-kvm'.
+
+spice is an optional dependency.

system/qemu-kvm/qemu-kvm.SlackBuild

@@ -84,6 +84,13 @@ sed -i "s|^CFLAGS=\"-g\ |CFLAGS=\"|" configure
 sed -i "s|^LDFLAGS=\"-g\ |LDFLAGS=\"|" configure
 sed -i "s|^\ \ CFLAGS=\"-O2\ |  CFLAGS=\"|" configure
 
+# check if spice support is enabled
+if pkg-config --exists spice-server ; then
+  with_spice="--enable-spice"
+else
+  with_spice="--disable-spice"
+fi
+
 # The script builds only the 32/64 bit x86 compatible Linux Target CPU emulator.
 # If you need to emulate other available architectures you should install the
 # "qemu" package, not the "qemu-kvm" package.  This package will only be useful
@@ -97,7 +104,8 @@ CFLAGS="$SLKCFLAGS" \
   --enable-mixemu \
   --audio-drv-list=alsa,oss,sdl,esd \
   --enable-system \
-  --target-list="x86_64-softmmu"
+  --target-list="x86_64-softmmu" \
+  $with_spice
 
 make V=1 \
   OS_CFLAGS="$SLKCFLAGS" \