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 <[email protected]>
Signed-off-by: Blue Swirl <[email protected]>
diff --git a/hw/smbios.c b/hw/smbios.c
index 8f2e965..c9ba43e 100644
--- a/hw/smbios.c
+++ b/hw/smbios.c
@@ -21,19 +21,19 @@
 struct smbios_header {
     uint16_t length;
     uint8_t type;
-} __attribute__((__packed__));
+} QEMU_PACKED;
 
 struct smbios_field {
     struct smbios_header header;
     uint8_t type;
     uint16_t offset;
     uint8_t data[];
-} __attribute__((__packed__));
+} QEMU_PACKED;
 
 struct smbios_table {
     struct smbios_header header;
     uint8_t data[];
-} __attribute__((__packed__));
+} QEMU_PACKED;
 
 #define SMBIOS_FIELD_ENTRY 0
 #define SMBIOS_TABLE_ENTRY 1