configure: Pull linux-headers/asm symlink creation out of loop

Pull the creation of the linux-headers/asm symlink out of the loop
so we don't pointlessly delete and recreate it once for each target.
Also move the setting of the includes variable up so that it is
in the same place as the other code which sets this variable.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

configure

@@ -3286,6 +3286,22 @@ for d in libdis libdis-user; do
     echo > $d/config.mak
 done
 
+# use included Linux headers
+if test "$linux" = "yes" ; then
+  mkdir -p linux-headers
+  case "$cpu" in
+  i386|x86_64)
+    symlink $source_path/linux-headers/asm-x86 linux-headers/asm
+    ;;
+  ppcemb|ppc|ppc64)
+    symlink $source_path/linux-headers/asm-powerpc linux-headers/asm
+    ;;
+  s390x)
+    symlink $source_path/linux-headers/asm-s390 linux-headers/asm
+    ;;
+  esac
+fi
+
 for target in $target_list; do
 target_dir="$target"
 config_target_mak=$target_dir/config-target.mak
@@ -3611,6 +3627,10 @@ else
 fi
 includes="-I\$(SRC_PATH)/tcg $includes"
 
+if test "$linux" = "yes" ; then
+  includes="-I\$(SRC_PATH)/linux-headers $includes"
+fi
+
 if test "$target_user_only" = "yes" ; then
     libdis_config_mak=libdis-user/config.mak
 else
@@ -3742,23 +3762,6 @@ if test "$target_linux_user" = "yes" -o "$target_bsd_user" = "yes" ; then
   esac
 fi
 
-# use included Linux headers
-if test "$linux" = "yes" ; then
-  includes="-I\$(SRC_PATH)/linux-headers $includes"
-  mkdir -p linux-headers
-  case "$cpu" in
-  i386|x86_64)
-    symlink $source_path/linux-headers/asm-x86 linux-headers/asm
-    ;;
-  ppcemb|ppc|ppc64)
-    symlink $source_path/linux-headers/asm-powerpc linux-headers/asm
-    ;;
-  s390x)
-    symlink $source_path/linux-headers/asm-s390 linux-headers/asm
-    ;;
-  esac
-fi
-
 echo "LDFLAGS+=$ldflags" >> $config_target_mak
 echo "QEMU_CFLAGS+=$cflags" >> $config_target_mak
 echo "QEMU_INCLUDES+=$includes" >> $config_target_mak