Add real simple kernel to files which are preprocessed

Makefile.am

@@ -47,7 +47,7 @@ if WITH_COMPLEX_GENERIC_KERNEL
 endif
 
 if WITH_REAL_GENERIC_SIMPLE_KERNEL
-  libelpa@SUFFIX@_la_SOURCES += src/elpa2_kernels/elpa2_kernels_real_simple.f90
+  libelpa@SUFFIX@_la_SOURCES += src/elpa2_kernels/elpa2_kernels_real_simple.F90
 endif
 
 if WITH_COMPLEX_GENERIC_SIMPLE_KERNEL

src/elpa2_kernels/elpa2_kernels_real_simple.f90 → src/elpa2_kernels/elpa2_kernels_real_simple.F90

@@ -55,6 +55,9 @@
 ! distributed along with the original code in the file "COPYING".
 !
 ! --------------------------------------------------------------------------------------------------
+
+#include "config-f90.h"
+
 module real_generic_simple_kernel
 
   private