cmake: Move BlueZ detection to Core

CMakeTests/FindBlueZ.cmake

@@ -0,0 +1,42 @@
+# - Find BlueZ library
+# This module defines
+#  BlueZ_INCLUDE_DIR
+#  BlueZ_LIBRARIES
+#  BlueZ_FOUND
+#
+# vim: expandtab sw=4 ts=4 sts=4:
+
+include(FindPkgConfig)
+pkg_check_modules (BlueZ_PKG QUIET bluez)
+
+find_path(BlueZ_INCLUDE_DIR NAMES bluetooth/bluetooth.h
+  PATHS
+  ${BlueZ_PKG_INCLUDE_DIRS}
+  /usr/include/bluetooth
+  /usr/include
+  /usr/local/include/bluetooth
+  /usr/local/include
+)
+
+find_library(BlueZ_LIBRARIES NAMES bluetooth
+  PATHS
+  ${BlueZ_PKG_LIBRARY_DIRS}
+  /usr/lib
+  /usr/local/lib
+)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(BlueZ
+                                  REQUIRED_VARS BlueZ_LIBRARIES BlueZ_INCLUDE_DIR)
+
+if(BlueZ_FOUND)
+  if(NOT TARGET BlueZ::BlueZ)
+    add_library(BlueZ::BlueZ UNKNOWN IMPORTED)
+    set_target_properties(BlueZ::BlueZ PROPERTIES
+      IMPORTED_LOCATION ${BlueZ_LIBRARIES}
+      INTERFACE_INCLUDE_DIRECTORIES ${BlueZ_INCLUDE_DIR}
+    )
+  endif()
+endif()
+
+mark_as_advanced(BlueZ_INCLUDE_DIR BlueZ_LIBRARIES)