qemu: Make qemuBuildShmemDevStr static

It isn't used anywhere else.
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

src/qemu/qemu_command.c

@@ -8503,7 +8503,7 @@ qemuBuildSmartcardCommandLine(virLogManagerPtr logManager,
 }
 
 
-char *
+static char *
 qemuBuildShmemDevStr(virDomainDefPtr def,
                      virDomainShmemDefPtr shmem,
                      virQEMUCapsPtr qemuCaps)

src/qemu/qemu_command.h

@@ -150,10 +150,6 @@ int qemuBuildRNGBackendProps(virDomainRNGDefPtr rng,
                              const char **type,
                              virJSONValuePtr *props);
 
-char *qemuBuildShmemDevStr(virDomainDefPtr def,
-                           virDomainShmemDefPtr shmem,
-                           virQEMUCapsPtr qemuCaps);
-
 int qemuOpenPCIConfig(virDomainHostdevDefPtr dev);
 
 /* Current, best practice */