[PHP] fix: make BaseListener abstract by default #925

Job	Run time
cpp-lib-build (macos-11, clang, ON)	4m 33s
build (macos-11, tool)	2m 0s
build (macos-11, cpp)	32m 57s
cpp-lib-build (macos-11, clang, OFF)	8m 44s
cpp-lib-build (macos-11, gcc, ON)	6m 11s
build (macos-11, csharp)	11m 11s
cpp-lib-build (macos-11, gcc, OFF)	9m 22s
build (macos-11, dart)	8m 23s
cpp-lib-build (ubuntu-20.04, clang, ON)	3m 41s
build (macos-11, go)	4m 46s
cpp-lib-build (ubuntu-20.04, clang, OFF)	8m 35s
cpp-lib-build (ubuntu-20.04, gcc, ON)	4m 20s
build (macos-11, java)	2m 27s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	6m 16s
cpp-lib-build (windows-2022, clang, ON)	8m 10s
build (macos-11, javascript)	6m 14s
build (macos-11, typescript)	18m 57s
cpp-lib-build (windows-2022, clang, OFF)	10m 35s
build (macos-11, php)	5m 7s
build (macos-11, python3)	1m 51s
cpp-lib-build (windows-2022, cl)	7m 47s
build (ubuntu-20.04, tool)	1m 46s
build (ubuntu-20.04, cpp)	23m 18s
build (ubuntu-20.04, csharp)	11m 0s
build (ubuntu-20.04, dart)	8m 26s
build (ubuntu-20.04, go)	4m 1s
build (ubuntu-20.04, java)	1m 58s
build (ubuntu-20.04, javascript)	2m 18s
build (ubuntu-20.04, typescript)	16m 15s
build (ubuntu-20.04, php)	2m 21s
build (ubuntu-20.04, python3)	1m 35s
build (windows-2022, tool)	2m 37s
build (windows-2022, cpp)	33m 42s
build (windows-2022, csharp)	13m 7s
build (windows-2022, dart)	9m 18s
build (windows-2022, go)	11m 28s
build (windows-2022, java)	3m 11s
build (windows-2022, javascript)	3m 35s
build (windows-2022, typescript)	40m 27s
build (windows-2022, php)	4m 15s
build (windows-2022, python3)	2m 35s
	6h 9m 20s

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