Remove the only sub-Makefile.am.inc

We have more than one top-level directory in the project so it does not
make sense to only recurse into one to find Makefile.am.inc files.  Get
rid of the lonely instance of this instead of sharding the already-simple
top-level Makefile.am.

Makefile.am

@@ -32,8 +32,6 @@ doc_DATA = AUTHORS COPYING NEWS README
 noinst_DATA = INSTALL README
 EXTRA_DIST = $(doc_DATA) INSTALL README
 
-include include/Makefile.am.inc
-
 LUTOK_CFLAGS = -I$(srcdir)/include $(LUA_CFLAGS)
 LUTOK_LIBS = liblutok.la $(LUA_LIBS)
 
@@ -46,6 +44,15 @@ pkginclude_HEADERS += state.hpp
 pkginclude_HEADERS += state.ipp
 pkginclude_HEADERS += test_utils.hpp
 
+EXTRA_DIST += include/lutok/README
+EXTRA_DIST += include/lutok/c_gate.hpp
+EXTRA_DIST += include/lutok/debug.hpp
+EXTRA_DIST += include/lutok/exceptions.hpp
+EXTRA_DIST += include/lutok/operations.hpp
+EXTRA_DIST += include/lutok/stack_cleaner.hpp
+EXTRA_DIST += include/lutok/state.hpp
+EXTRA_DIST += include/lutok/state.ipp
+
 lib_LTLIBRARIES = liblutok.la
 liblutok_la_SOURCES  = c_gate.cpp
 liblutok_la_SOURCES += c_gate.hpp