configure: support --disable-dependency-tracking

One-time build may enjoy little speedup of build when dependencies are not
calculated.

WHATS_NEW

@@ -1,5 +1,6 @@
 Version 2.02.131 - 
 =====================================
+  Configure supports --disable-dependency-tracking for one-time builds.
   Fix usage of configure.h when building in srcdir != builddir.
 
 Version 2.02.130 - 5th September 2015

configure.in

@@ -155,6 +155,15 @@ AC_FUNC_STAT
 AC_FUNC_STRTOD
 AC_FUNC_VPRINTF
 
+################################################################################
+dnl -- Disable dependency tracking
+AC_MSG_CHECKING(whether to disable dependency tracking)
+AC_ARG_ENABLE(dependency-tracking,
+	      AC_HELP_STRING([--disable-dependency-tracking],
+			     [speeds up one-time build.]),
+	      USE_TRACKING=$enableval, USE_TRACKING=yes)
+AC_MSG_RESULT($USE_TRACKING)
+
 ################################################################################
 dnl -- Enables statically-linked tools
 AC_MSG_CHECKING(whether to use static linking)
@@ -2023,6 +2032,7 @@ AC_SUBST(UDEV_SYNC)
 AC_SUBST(UDEV_SYSTEMD_BACKGROUND_JOBS)
 AC_SUBST(UDEV_RULE_EXEC_DETECTION)
 AC_SUBST(UDEV_HAS_BUILTIN_BLKID)
+AC_SUBST(USE_TRACKING)
 AC_SUBST(VALGRIND_POOL)
 AC_SUBST(WRITE_INSTALL)
 AC_SUBST(DMEVENTD_PIDFILE)

make.tmpl.in

@@ -511,6 +511,7 @@ else
 	) > $@
 endif
 
+ifeq ("@USE_TRACKING@","yes")
 ifeq (,$(findstring $(MAKECMDGOALS),cscope.out cflow clean distclean lcov \
  help check check_local check_cluster check_lvmetad check_lvmpolld))
     ifdef SOURCES
@@ -520,3 +521,4 @@ ifeq (,$(findstring $(MAKECMDGOALS),cscope.out cflow clean distclean lcov \
        -include $(SOURCES2:.c=.d)
     endif
 endif
+endif