Add missing makefile.am in src/math/dense

and add src/math/dense to AC_CONFIG_FILES
in configure.ac

configure.ac

@@ -1424,6 +1424,7 @@ AC_CONFIG_FILES([Makefile
                  src/maths/deriv/Makefile
                  src/maths/poly/Makefile
                  src/maths/sparse/Makefile
+                 src/maths/dense/Makefile
                  src/misc/Makefile
                  src/xspice/Makefile
                  src/xspice/cm/Makefile

src/maths/dense/Makefile.am

@@ -0,0 +1,11 @@
+## Process this file with automake to produce Makefile.in
+
+noinst_LTLIBRARIES = libdense.la
+
+libdense_la_SOURCES = \
+		dense.c
+
+
+AM_CPPFLAGS = @AM_CPPFLAGS@ -I$(top_srcdir)/src/include -I$(top_srcdir)/src/maths/dense
+AM_CFLAGS = $(STATIC)
+MAINTAINERCLEANFILES = Makefile.in