linuxrc: create /etc/ld.so.cache if it's not in the initramfs

defaults/initrd.d/00-common.sh

@@ -88,3 +88,13 @@ rundebugshell() {
         do_rundebugshell
     fi
 }
+
+maybe_setup_ld_cache() {
+    # This calls ldconfig if /etc/ld.so.cache was not
+    # created at initramfs build time. This may happen
+    # if the initramfs was generated by an unprivileged user
+    # since running ldconfig -r requires root privileges.
+    if [ ! -e "/etc/ld.so.cache" ]; then
+        ldconfig
+    fi
+}

defaults/linuxrc

@@ -257,6 +257,8 @@ done
 
 quiet_kmsg
 
+maybe_setup_ld_cache
+
 real_init_init
 
 is_livecd || {