qemu: Use more specific prefixes

While the chances of the current checks resulting in false
positives are basically zero, it's still nicer to check for
the full prefix instead of the prefix's prefix.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>

src/qemu/qemu_domain.c

@@ -9885,7 +9885,7 @@ qemuDomainIsQ35(const virDomainDef *def)
 bool
 qemuDomainMachineIsQ35(const char *machine)
 {
-    return (STRPREFIX(machine, "pc-q35") ||
+    return (STRPREFIX(machine, "pc-q35-") ||
             STREQ(machine, "q35"));
 }
 
@@ -9903,7 +9903,7 @@ qemuDomainMachineIsI440FX(const char *machine)
     return (STREQ(machine, "pc") ||
             STRPREFIX(machine, "pc-0.") ||
             STRPREFIX(machine, "pc-1.") ||
-            STRPREFIX(machine, "pc-i440") ||
+            STRPREFIX(machine, "pc-i440fx-") ||
             STRPREFIX(machine, "rhel"));
 }