pc: Remove PCLMULQDQ from Westmere on pc-*-1.4 and older

Commit 41cb383f made a guest-visible
change by adding the PCLMULQDQ bit to Westmere without adding
compatibility code to keep the ABI for older machine-types.
Fix it by adding the missing compat code.
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>
Signed-off-by: NAndreas Färber <afaerber@suse.de>

hw/i386/pc_piix.c

@@ -265,6 +265,7 @@ static void pc_init_pci_1_4(QEMUMachineInitArgs *args)
 {
     has_pvpanic = false;
     x86_cpu_compat_set_features("n270", FEAT_1_ECX, 0, CPUID_EXT_MOVBE);
+    x86_cpu_compat_set_features("Westmere", FEAT_1_ECX, 0, CPUID_EXT_PCLMULQDQ);
     pc_init_pci_1_5(args);
 }
 

hw/i386/pc_q35.c

@@ -233,6 +233,7 @@ static void pc_q35_init_1_4(QEMUMachineInitArgs *args)
 {
     has_pvpanic = false;
     x86_cpu_compat_set_features("n270", FEAT_1_ECX, 0, CPUID_EXT_MOVBE);
+    x86_cpu_compat_set_features("Westmere", FEAT_1_ECX, 0, CPUID_EXT_PCLMULQDQ);
     pc_q35_init_1_5(args);
 }