Use new macro QEMU_PACKED for packed structures

Most changes were made using these commands:

git grep -la '__attribute__((packed))'|xargs perl -pi -e 's/__attribute__\(\(packed\)\)/QEMU_PACKED/'
git grep -la '__attribute__ ((packed))'|xargs perl -pi -e 's/__attribute__ \(\(packed\)\)/QEMU_PACKED/'
git grep -la '__attribute__((__packed__))'|xargs perl -pi -e 's/__attribute__\(\(__packed__\)\)/QEMU_PACKED/'
git grep -la '__attribute__ ((__packed__))'|xargs perl -pi -e 's/__attribute__ \(\(__packed__\)\)/QEMU_PACKED/'
git grep -la '__attribute((packed))'|xargs perl -pi -e 's/__attribute\(\(packed\)\)/QEMU_PACKED/'

Whitespace in linux-user/syscall_defs.h was fixed manually
to avoid warnings from scripts/checkpatch.pl.

Manual changes were also applied to hw/pc.c.

I did not fix indentation with tabs in block/vvfat.c.
The patch will show 4 errors with scripts/checkpatch.pl.

Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/hw/ide/atapi.c b/hw/ide/atapi.c
index c552320..f38d289 100644
--- a/hw/ide/atapi.c
+++ b/hw/ide/atapi.c
@@ -557,13 +557,13 @@
         uint8_t reserved3[2];
         uint16_t len;
         uint8_t control;
-    } __attribute__((packed)) *gesn_cdb;
+    } QEMU_PACKED *gesn_cdb;
 
     struct {
         uint16_t len;
         uint8_t notification_class;
         uint8_t supported_events;
-    } __attribute((packed)) *gesn_event_header;
+    } QEMU_PACKED *gesn_event_header;
 
     enum notification_class_request_type {
         NCR_RESERVED1 = 1 << 0,