Remove annoying circular dependency

Was introduced recently, when I moved the private headers to src/

generated_headers.am

@@ -36,13 +36,13 @@ test/shared/generated.h: $(wildcard $(top_srcdir)/test/shared/*.*90) | test/shar
 	$(call extract_interface,!c>)
 
 generated_headers += src/elpa_generated_fortran_interfaces.h
-src/elpa_generated_fortran_interfaces.h: $(wildcard $(top_srcdir)/src/elpa2/kernels/*.*c $(top_srcdir)/src/elpa2/kernels/*.s $(top_srcdir)/src/*.[ch]) | src
+src/elpa_generated_fortran_interfaces.h: $(filter-out $(wildcard $(top_srcdir)/src/*generated*), $(wildcard $(top_srcdir)/src/elpa2/kernels/*.*c $(top_srcdir)/src/elpa2/kernels/*.s $(top_srcdir)/src/*.[ch])) | src
 	@rm -f $@
 	$(call extract_interface,!f>)
 	$(call extract_interface,#!f>)
 
 generated_headers += src/elpa_generated_public_fortran_interfaces.h
-src/elpa_generated_public_fortran_interfaces.h: $(wildcard $(top_srcdir)/src/*.[ch]) | src
+src/elpa_generated_public_fortran_interfaces.h: $(filter-out $(wildcard $(top_srcdir)/src/*generated*), $(wildcard $(top_srcdir)/src/*.[ch])) | src
 	@rm -f $@
 	$(call extract_interface,!pf>)