Fix generation of CONFIG_KVM

When configuring for several targets, some with KVM and some without, CONFIG_KVM was accidentally disabled for some of the targets.
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

configure

@@ -1862,17 +1862,18 @@ target_nptl="no"
 interp_prefix1=`echo "$interp_prefix" | sed "s/%M/$target_cpu/g"`
 echo "#define CONFIG_QEMU_PREFIX \"$interp_prefix1\"" >> $config_h
 gdb_xml_files=""
+target_kvm="$kvm"
 
 # Make sure the target and host cpus are compatible
-if test "$kvm" = "yes" -a ! \( "$target_cpu" = "$cpu" -o \
+if test ! \( "$target_cpu" = "$cpu" -o \
   \( "$target_cpu" = "ppcemb" -a "$cpu" = "ppc" \) -o \
   \( "$target_cpu" = "x86_64" -a "$cpu" = "i386"   \) -o \
   \( "$target_cpu" = "i386"   -a "$cpu" = "x86_64" \) \) ; then
-  kvm="no"
+  target_kvm="no"
 fi
 # Disable KVM for linux-user
-if test "$kvm" = "yes" -a "$target_softmmu" = "no" ; then
-  kvm="no"
+if test "$target_softmmu" = "no" ; then
+  target_kvm="no"
 fi
 
 case "$target_cpu" in
@@ -1885,7 +1886,7 @@ case "$target_cpu" in
       echo "CONFIG_KQEMU=yes" >> $config_mak
       echo "#define CONFIG_KQEMU 1" >> $config_h
     fi
-    if test "$kvm" = "yes" ; then
+    if test "$target_kvm" = "yes" ; then
       echo "CONFIG_KVM=yes" >> $config_mak
       echo "KVM_CFLAGS=$kvm_cflags" >> $config_mak
       echo "#define CONFIG_KVM 1" >> $config_h
@@ -1907,7 +1908,7 @@ case "$target_cpu" in
       echo "CONFIG_KQEMU=yes" >> $config_mak
       echo "#define CONFIG_KQEMU 1" >> $config_h
     fi
-    if test "$kvm" = "yes" ; then
+    if test "$target_kvm" = "yes" ; then
       echo "CONFIG_KVM=yes" >> $config_mak
       echo "KVM_CFLAGS=$kvm_cflags" >> $config_mak
       echo "#define CONFIG_KVM 1" >> $config_h
@@ -1992,7 +1993,7 @@ case "$target_cpu" in
     echo "#define TARGET_ARCH \"ppcemb\"" >> $config_h
     echo "#define TARGET_PPC 1" >> $config_h
     echo "#define TARGET_PPCEMB 1" >> $config_h
-    if test "$kvm" = "yes" ; then
+    if test "$target_kvm" = "yes" ; then
       echo "CONFIG_KVM=yes" >> $config_mak
       echo "KVM_CFLAGS=$kvm_cflags" >> $config_mak
       echo "#define CONFIG_KVM 1" >> $config_h