*/Makefile.am: Replace INCLUDES with AM_CPPFLAGS

Catch up with Automake's [1], which was part of v1.6b, cut 2002-07-28
[2].  Avoids:

  $ autoreconf -v -f --install
  ...
  libmisc/Makefile.am:4: warning: 'INCLUDES' is the old name for 'AM_CPPFLAGS' (or '*_CPPFLAGS')
  ...
  src/Makefile.am:10: warning: 'INCLUDES' is the old name for 'AM_CPPFLAGS' (or '*_CPPFLAGS')
  ...

Consolidating with the earlier AM_CPPFLAGS avoids:

  $ autoreconf -v -f --install
  src/Makefile.am:72: warning: AM_CPPFLAGS multiply defined in condition TRUE ...
  src/Makefile.am:10: ... 'AM_CPPFLAGS' previously defined here
  autoreconf-2.69: Leaving directory `.'

[1]: http://git.savannah.gnu.org/cgit/automake.git/commit/?id=1415d22f6203206bc393fc4ea233123ba579222d
     Summary: automake.in (generate_makefile): Suggest using AM_CPPFLAGS instead of INCLUDES
     Date: 2002-07-09
[2]: http://git.savannah.gnu.org/cgit/automake.git/tag/?id=Release-1-6b

libmisc/Makefile.am

@@ -1,7 +1,7 @@
 
 EXTRA_DIST = .indent.pro xgetXXbyYY.c
 
-INCLUDES = -I$(top_srcdir)/lib
+AM_CPPFLAGS = -I$(top_srcdir)/lib
 
 noinst_LIBRARIES = libmisc.a
 

src/Makefile.am

@@ -7,9 +7,10 @@ usbindir = ${prefix}/sbin
 suidperms = 4755
 sgidperms = 2755
 
-INCLUDES = \
+AM_CPPFLAGS = \
 	-I${top_srcdir}/lib \
-	-I$(top_srcdir)/libmisc
+	-I$(top_srcdir)/libmisc \
+	-DLOCALEDIR=\"$(datadir)/locale\"
 
 # XXX why are login and su in /bin anyway (other than for
 # historical reasons)?
@@ -69,7 +70,6 @@ LDADD          = $(INTLLIBS) \
 		 $(LIBTCB) \
 		 $(top_builddir)/libmisc/libmisc.a \
 		 $(top_builddir)/lib/libshadow.la
-AM_CPPFLAGS    = -DLOCALEDIR=\"$(datadir)/locale\"
 
 if ACCT_TOOLS_SETUID
 LIBPAM_SUID  = $(LIBPAM)