includes: install them

This commit installs the required include files needed for CDE
development.  In pre-autotools CDE, these were installed in
/usr/dt/share/include/ and a symlink was created in /usr/dt/include to
point toward them.

This is no longer done, and all include files are just installed in
${prefix}/include/ like the rest of the planet.

cde/include/Makefile.am

@@ -0,0 +1,32 @@
+MAINTAINERCLEANFILES = Makefile.in
+
+# Install the header files
+
+nobase_include_HEADERS = Dt/Editor.h \
+	Dt/TermPrim.h \
+	Dt/Term.h \
+	Dt/HelpDialog.h \
+	Dt/Help.h \
+	Dt/HelpQuickD.h \
+	Dt/Print.h \
+	Dt/Mrm.h \
+	Dt/Dt.h \
+	Dt/Action.h \
+	Dt/Dnd.h \
+	Dt/Dts.h \
+	Dt/Session.h \
+	Dt/Saver.h \
+	Dt/Wsm.h \
+	Dt/MsgLog.h \
+	Dt/ComboBox.h \
+	Dt/SpinBox.h \
+	Dt/MenuButton.h \
+	Tt/tt_c.h \
+	Tt/tttk.h \
+	csa/csa.h \
+	Dt/Info.h \
+	Dt/Search.h \
+	Dt/Mmdb.h
+
+
+