Expose OpenAL lib name and the include directory.

libs/openal-soft-1.15.1/CMakeLists.txt

@@ -76,6 +76,8 @@ ELSE()
     SET(LIBNAME openal)
 ENDIF()
 
+SET(OPENAL_LIB_NAME ${LIBNAME} PARENT_SCOPE)
+
 IF(NOT LIBTYPE)
     SET(LIBTYPE SHARED)
 ENDIF()
@@ -759,6 +761,7 @@ IF(WIN32 AND NOT LIBTYPE STREQUAL "STATIC")
 ENDIF()
 
 TARGET_LINK_LIBRARIES(${LIBNAME} ${EXTRA_LIBS})
+TARGET_INCLUDE_DIRECTORIES(${LIBNAME} PUBLIC include)
 
 # Add an install target here
 INSTALL(TARGETS ${LIBNAME}