Apply megasource changes to OpenAL-Soft cmakelists

libs/openal-soft/CMakeLists.txt

@@ -1378,6 +1378,8 @@ else()
     endif()
 endif()
 
+set(OPENAL_LIB_NAME ${IMPL_TARGET} PARENT_SCOPE)
+
 target_include_directories(${IMPL_TARGET}
   PUBLIC
     $<BUILD_INTERFACE:${OpenAL_SOURCE_DIR}/include>
@@ -1708,3 +1710,7 @@ if(EXTRA_INSTALLS)
         LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
         ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
 endif()
+
+if(MEGA)
+    install(TARGETS ${IMPL_TARGET} RUNTIME DESTINATION . LIBRARY DESTINATION .)
+endif()