remove deprecated functionality (#542)

Co-authored-by: Andreas Viborg <andreas.viborg@maxar.com>
Co-authored-by: Robert Edmonds <edmonds@users.noreply.github.com>

build-cmake/CMakeLists.txt

@@ -118,12 +118,6 @@ IF (MSVC AND BUILD_SHARED_LIBS)
 	FILE(COPY ${PROTOBUF_DLLS} DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
 ENDIF (MSVC AND BUILD_SHARED_LIBS)
 
-IF(CMAKE_HOST_UNIX)
-ADD_CUSTOM_COMMAND(TARGET ${PROJECT_NAME} POST_BUILD
-                   COMMAND ln -sf protoc-gen-c protoc-c
-                   DEPENDS protoc-gen-c)
-ENDIF()
-
 FUNCTION(GENERATE_TEST_SOURCES PROTO_FILE SRC HDR)
 	ADD_CUSTOM_COMMAND(OUTPUT ${SRC} ${HDR}
                    COMMAND ${PROTOBUF_PROTOC_EXECUTABLE}
@@ -207,10 +201,6 @@ INSTALL(FILES ${MAIN_DIR}/protobuf-c/protobuf-c.h ${MAIN_DIR}/protobuf-c/protobu
 INSTALL(FILES ${MAIN_DIR}/protobuf-c/protobuf-c.h DESTINATION include)
 INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/protobuf-c.pdb DESTINATION lib OPTIONAL)
 
-IF(CMAKE_HOST_UNIX)
-INSTALL(CODE "EXECUTE_PROCESS (COMMAND ln -sf protoc-gen-c protoc-c WORKING_DIRECTORY ${CMAKE_INSTALL_PREFIX}/bin)")
-ENDIF()
-
 SET(prefix ${CMAKE_INSTALL_PREFIX})
 SET(exec_prefix \${prefix})
 SET(bindir \${exec_prefix}/${CMAKE_INSTALL_BINDIR})