Make shared and static libraries simultaneously

# make both shared and static libraries
# https://stackoverflow.com/a/29824424/5066426
add_library(objlib OBJECT ${BWAPIC_SRC})
set_property(TARGET ${objlib} PROPERTY POSITION_INDEPENDENT_CODE 1)

add_library(BWAPIC_shared SHARED $<TARGET_OBJECTS:objlib>)
add_library(BWAPIC_static STATIC $<TARGET_OBJECTS:objlib>)
#add_library(BWAPIC_shared SHARED ${BWAPIC_SRC})
#add_library(BWAPIC_static STATIC ${BWAPIC_SRC})

target_include_directories(BWAPIC_shared SYSTEM PUBLIC include/ ${BWAPI_INCLUDE_DIRS})
target_include_directories(BWAPIC_static SYSTEM PUBLIC include/ ${BWAPI_INCLUDE_DIRS})
target_link_libraries(BWAPIC_shared PRIVATE BWAPI BWAPIClient)