Remove CMake config special case for Nominatim integration

Not needed any more, because Nominatim now works with stock osm2pgsql.

Author: joto

CMakeLists.txt

@@ -7,15 +7,6 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
-# Do not create install targets when run as a subproject.
-# Currently used by Nominatim which cannot yet rely on installed versions
-# of osm2pgsql.
-if (${PROJECT_NAME} STREQUAL ${CMAKE_PROJECT_NAME})
-    set(ENABLE_INSTALL ON)
-else()
-    set(ENABLE_INSTALL OFF)
-endif()
-
 if (NOT ${CMAKE_SIZEOF_VOID_P} EQUAL 8)
     message(FATAL_ERROR "osm2pgsql needs a 64 bit architecture")
 endif()