Makefile.in: Make the version-suffixed executable conditional. [skip ci]

As discussed on tcpdump-workers.  This way people that need to compare
different tcpdump versions manually have the convenience of automatic
versioned executables and people that need to build a package
automatically don't have the inconvenience of having to remove the
versioned executable from the resulting package.

Author: infrastation

CHANGES

@@ -62,6 +62,8 @@ DayOfTheWeek, Month DD, YYYY / The Tcpdump Group
       Makefile.in: Update the .c.o build rule (Remove hacks for old SunOS 4).
       Autoconf: fix buggy tests for ether_ntohost().
       CMake: Skip snprintf(3) tests when cross-compiling.
+      Makefile.in: Do not install a version-suffixed tcpdump binary if the
+        .devel file does not exists.
     Documentation:
       man: Clarify the "any" pseudo-interface further.
 

Makefile.in

@@ -403,7 +403,7 @@ install: all
 	[ -d $(DESTDIR)$(bindir) ] || \
 	    (mkdir -p $(DESTDIR)$(bindir); chmod 755 $(DESTDIR)$(bindir))
 	$(INSTALL_PROGRAM) $(PROG) $(DESTDIR)$(bindir)/$(PROG)
-	$(INSTALL_PROGRAM) $(PROG) $(DESTDIR)$(bindir)/$(PROG).`cat ${srcdir}/VERSION`
+	[ ! -f "${srcdir}/.devel" ] || $(INSTALL_PROGRAM) $(PROG) $(DESTDIR)$(bindir)/$(PROG).`cat ${srcdir}/VERSION`
 	[ -d $(DESTDIR)$(mandir)/man1 ] || \
 	    (mkdir -p $(DESTDIR)$(mandir)/man1; chmod 755 $(DESTDIR)$(mandir)/man1)
 	$(INSTALL_DATA) $(PROG).1 $(DESTDIR)$(mandir)/man1/$(PROG).1