remove references to EXTRA_THERMO (#2512)

this is now handled automatically via a struct

Docs/source/FlowChart.rst

@@ -56,8 +56,7 @@ The time-integration method used is controlled by
     order integration implemented.  At the moment, this does not support
     multilevel domains.  Note: because of differences in the interfaces with the 
     default Strang method, you must compile with ``USE_TRUE_SDC = TRUE`` for this
-    method to work (in particular, this defines ``EXTRA_THERMO`` which enables some
-    additional EOS derivatives).
+    method to work.
 
   * ``time_integration_method = 3``: this is the simplified SDC method
     described above that uses the CTU hydro advection and an ODE

Exec/Make.Castro

@@ -186,18 +186,6 @@ endif
 ifeq ($(USE_REACT), TRUE)
   Bdirs += Source/reactions
   DEFINES += -DREACTIONS
-
-  ifeq ($(USE_TRUE_SDC), TRUE)
-    # we need the compositional derivatives for SDC
-    DEFINES += -DEXTRA_THERMO
-  endif
-
-  ifeq ($(USE_SIMPLIFIED_SDC), TRUE)
-    # we need the compositional derivatives for SDC
-    DEFINES += -DEXTRA_THERMO
-    # we only implement this for C++ reactions
-  endif
-
 endif
 
 ifeq ($(USE_REACT_SPARSE_JACOBIAN), TRUE)