qemu: Make qemuBuildShmemBackendStr private

It's not used externally anywhere else
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

src/qemu/qemu_command.c

@@ -8273,7 +8273,7 @@ qemuBuildShmemDevStr(virDomainDefPtr def,
     return NULL;
 }
 
-char *
+static char *
 qemuBuildShmemBackendStr(virLogManagerPtr logManager,
                          virCommandPtr cmd,
                          virDomainDefPtr def,

src/qemu/qemu_command.h

@@ -142,12 +142,6 @@ int qemuBuildRNGBackendProps(virDomainRNGDefPtr rng,
 char *qemuBuildShmemDevStr(virDomainDefPtr def,
                            virDomainShmemDefPtr shmem,
                            virQEMUCapsPtr qemuCaps);
-char *qemuBuildShmemBackendStr(virLogManagerPtr logManager,
-                               virCommandPtr cmd,
-                               virDomainDefPtr def,
-                               virDomainShmemDefPtr shmem,
-                               virQEMUCapsPtr qemuCaps);
-
 
 int qemuOpenPCIConfig(virDomainHostdevDefPtr dev);