update-linux-headers.sh: unistd.h, kvm consistency

Rework the update script slightly, add the unistd.h header and its
dependencies on all architectures.

This also removes the IA64 and MIPS from a KVM blacklist:
Linux dropped IA64, and there was never a reason to
exclude MIPS from kvm specifically - it was
excluded due to dependency of its unistd.h on sgidefs.h,
which we also import.

Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

scripts/update-linux-headers.sh

@@ -84,11 +84,6 @@ for arch in $ARCHLIST; do
         continue
     fi
 
-    # Blacklist architectures which have KVM headers but are actually dead
-    if [ "$arch" = "ia64" -o "$arch" = "mips" ]; then
-        continue
-    fi
-
     if [ "$arch" = x86 ]; then
         arch_var=SRCARCH
     else
@@ -99,9 +94,14 @@ for arch in $ARCHLIST; do
 
     rm -rf "$output/linux-headers/asm-$arch"
     mkdir -p "$output/linux-headers/asm-$arch"
-    for header in kvm.h unistd.h; do
+    for header in kvm.h unistd.h bitsperlong.h; do
         cp "$tmpdir/include/asm/$header" "$output/linux-headers/asm-$arch"
     done
+
+    if [ $arch = mips ]; then
+        cp "$tmpdir/include/asm/sgidefs.h" "$output/linux-headers/asm-mips/"
+    fi
+
     rm -rf "$output/include/standard-headers/asm-$arch"
     mkdir -p "$output/include/standard-headers/asm-$arch"
     if [ $arch = s390 ]; then
@@ -129,6 +129,12 @@ for header in kvm.h vfio.h vfio_ccw.h vhost.h \
     cp "$tmpdir/include/linux/$header" "$output/linux-headers/linux"
 done
 
+rm -rf "$output/linux-headers/asm-generic"
+mkdir -p "$output/linux-headers/asm-generic"
+for header in unistd.h bitsperlong.h; do
+    cp "$tmpdir/include/asm-generic/$header" "$output/linux-headers/asm-generic"
+done
+
 if [ -L "$linux/source" ]; then
     cp "$linux/source/COPYING" "$output/linux-headers"
 else