smb: Remove obsolete KDNSSD version check and define

KF 5.66 is required, and the code dependent on the define was removed
with commit 41397521 ("add initial wsdiscovery support").

CMakeLists.txt

@@ -195,12 +195,6 @@ if(NOT WIN32)
    endif()
 endif()
 
-# KDNSSD before 5.54 suffers from a race condition in avahi's dbus API and
-# ideally should not be used in ways that can deadlock a slave.
-if(${KF5DNSSD_FOUND} AND ${KF5DNSSD_VERSION} VERSION_GREATER "5.53")
-    set(HAVE_KDNSSD_WITH_SIGNAL_RACE_PROTECTION TRUE)
-endif()
-
 if(SAMBA_FOUND)
     add_subdirectory(smb)
 endif()

config-runtime.h.cmake

@@ -14,6 +14,3 @@
  * Using the definition from this project so as to be independent of Plasma.
  */
 #define KDE_VERSION_STRING "@PROJECT_VERSION@"
-
-/* kdnssd with signal race protection */
-#cmakedefine HAVE_KDNSSD_WITH_SIGNAL_RACE_PROTECTION 1

smb/CMakeLists.txt

@@ -16,9 +16,6 @@ endif()
 add_feature_info("Internal KDSoapWSDiscoveryClient" INTERNAL_WSDCLIENT
     "Building using internal client because a system-provided version could not be found.")
 
-add_feature_info("SMB DNS-SD Discovery" HAVE_KDNSSD_WITH_SIGNAL_RACE_PROTECTION
-    "Discover SMB hosts via DNS-SD/Avahi/Bonjour. KF5DNSSD >= 5.54 is required to support this.")
-
 find_package(Threads REQUIRED)
 
 add_definitions(-DTRANSLATION_DOMAIN=\"kio5_smb\")