Change: Don't install sync scripts by default

The shell based greenbone-feed-sync script got replaced by a Python
version that can be found at https://github.com/greenbone/greenbone-feed-sync/
The new python based version is easier to maintain, more flexible and
can be released independently.

The old sync scripts are kept only for backwards compatibility reasons
and may be installed by setting the cmake parameter
`INSTALL_OLD_SYNC_SCRIPTS` (for example
`cmake -DINSTALL_OLD_SYNC_SCRIPTS=ON`).

(cherry picked from commit 6a8583b)

CMakeLists.txt

@@ -37,6 +37,8 @@ endif (NOT CMAKE_BUILD_TYPE)
 
 OPTION (ENABLE_COVERAGE "Enable support for coverage analysis" OFF)
 OPTION (DEBUG_FUNCTION_NAMES "Print function names on entry and exit" OFF)
+# the shell based scripts got replaced by https://github.com/greenbone/greenbone-feed-sync/
+OPTION (INSTALL_OLD_SYNC_SCRIPTS "Install shell based feed sync scripts" OFF)
 
 ## Retrieve git revision (at configure time)
 include (GetGit)
@@ -394,20 +396,22 @@ install (FILES tools/cert_bund_getbyname.xsl tools/dfn_cert_getbyname.xsl
          DESTINATION ${GVM_CERT_RES_DIR}
          PERMISSIONS OWNER_WRITE OWNER_READ GROUP_READ WORLD_READ)
 
-install (FILES ${CMAKE_BINARY_DIR}/tools/greenbone-feed-sync
-         DESTINATION ${SBINDIR}
-         PERMISSIONS OWNER_EXECUTE OWNER_READ OWNER_WRITE
-                     GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
-
-install (FILES ${CMAKE_BINARY_DIR}/tools/greenbone-scapdata-sync
-         DESTINATION ${SBINDIR}
-         PERMISSIONS OWNER_EXECUTE OWNER_READ OWNER_WRITE
-                     GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
-
-install (FILES ${CMAKE_BINARY_DIR}/tools/greenbone-certdata-sync
-         DESTINATION ${SBINDIR}
-         PERMISSIONS OWNER_EXECUTE OWNER_READ OWNER_WRITE
-                     GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
+if (INSTALL_OLD_SYNC_SCRIPTS)
+  install (FILES ${CMAKE_BINARY_DIR}/tools/greenbone-feed-sync
+          DESTINATION ${SBINDIR}
+          PERMISSIONS OWNER_EXECUTE OWNER_READ OWNER_WRITE
+                      GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
+
+  install (FILES ${CMAKE_BINARY_DIR}/tools/greenbone-scapdata-sync
+          DESTINATION ${SBINDIR}
+          PERMISSIONS OWNER_EXECUTE OWNER_READ OWNER_WRITE
+                      GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
+
+  install (FILES ${CMAKE_BINARY_DIR}/tools/greenbone-certdata-sync
+          DESTINATION ${SBINDIR}
+          PERMISSIONS OWNER_EXECUTE OWNER_READ OWNER_WRITE
+                      GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
+endif (INSTALL_OLD_SYNC_SCRIPTS)
 
 install (FILES ${CMAKE_SOURCE_DIR}/tools/gvm-lsc-deb-creator
                ${CMAKE_SOURCE_DIR}/tools/gvm-lsc-exe-creator