Remove wrapper in makefile

src/Makefile.am

@@ -48,11 +48,6 @@ include_HEADERS = space.h runner.h queue.h task.h lock.h cell.h part.h const.h \
     dump.h logger.h active.h timeline.h xmf.h gravity_properties.h gravity_derivatives.h \
     gravity_softened_derivatives.h vector_power.h collectgroup.h hydro_space.h sort_part.h
 
-GRACKLE_SRC =
-if HAVEGRACKLE
-GRACKLE_SRC += cooling/grackle/grackle_wrapper.c
-endif
-
 # Common source files
 AM_SOURCES = space.c runner.c queue.c task.c cell.c engine.c \
     serial_io.c timers.c debug.c scheduler.c proxy.c parallel_io.c \
@@ -62,8 +57,7 @@ AM_SOURCES = space.c runner.c queue.c task.c cell.c engine.c \
     runner_doiact_fft.c threadpool.c cooling.c sourceterms.c \
     statistics.c runner_doiact_vec.c profiler.c dump.c logger.c \
     part_type.c xmf.c gravity_properties.c gravity.c \
-    collectgroup.c hydro_space.c equation_of_state.c \
-    $(GRACKLE_SRC)
+    collectgroup.c hydro_space.c equation_of_state.c
 
 
 # Include files for distribution, not installation.