Ship mariadb.service and mysql[d].service symlinks

Create symlinks during configure time and install them. This is
necessary as Alias support from systemd service file was dropped with:
6af0bd69

* Also ignore the generated symlinks in gitignore

.gitignore

@@ -263,8 +263,9 @@ support-files/config.huge.ini
 support-files/config.medium.ini
 support-files/config.small.ini
 support-files/mariadb.pc
-support-files/mariadb@.service
+support-files/mariadb.pp
 support-files/mariadb.service
+support-files/mariadb@.service
 support-files/my-huge.cnf
 support-files/my-innodb-heavy-4G.cnf
 support-files/my-large.cnf
@@ -273,14 +274,15 @@ support-files/my-small.cnf
 support-files/mysql-log-rotate
 support-files/mysql.10.0.11.spec
 support-files/mysql.server
+support-files/mysql.service
 support-files/mysql.spec
+support-files/mysqld.service
 support-files/mysqld_multi.server
-support-files/wsrep.cnf
-support-files/wsrep_notify
 support-files/policy/selinux/mysqld-safe.pp
 support-files/sysusers.conf
 support-files/tmpfiles.conf
-support-files/mariadb.pp
+support-files/wsrep.cnf
+support-files/wsrep_notify
 tags
 tests/async_queries
 tests/bug25714

support-files/CMakeLists.txt

@@ -120,8 +120,15 @@ IF(UNIX)
   IF(HAVE_SYSTEMD)
     CONFIGURE_FILE(mariadb.service.in
                    ${CMAKE_CURRENT_BINARY_DIR}/mariadb.service @ONLY)
+    EXECUTE_PROCESS(
+    COMMAND ${CMAKE_COMMAND} -E create_symlink ./mariadb.service mysql.service
+    COMMAND ${CMAKE_COMMAND} -E create_symlink ./mariadb.service mysqld.service
+    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+
     INSTALL(FILES use_galera_new_cluster.conf
             ${CMAKE_CURRENT_BINARY_DIR}/mariadb.service
+            ${CMAKE_CURRENT_BINARY_DIR}/mysql.service
+            ${CMAKE_CURRENT_BINARY_DIR}/mysqld.service
             DESTINATION ${inst_location}/systemd COMPONENT SupportFiles)
 
     # @ in directory name broken between CMake version 2.8.12.2 and 3.3
@@ -134,7 +141,10 @@ IF(UNIX)
     ENDIF()
 
     IF(INSTALL_SYSTEMD_UNITDIR)
-      INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/mariadb.service
+      INSTALL(FILES
+              ${CMAKE_CURRENT_BINARY_DIR}/mariadb.service
+              ${CMAKE_CURRENT_BINARY_DIR}/mysql.service
+              ${CMAKE_CURRENT_BINARY_DIR}/mysqld.service
               DESTINATION ${INSTALL_SYSTEMD_UNITDIR} COMPONENT Server)
 
       # http://public.kitware.com/Bug/view.php?id=14782