Per #2138, only compile tc_diag when --enable-python is set.

src/tools/tc_utils/Makefile.in

@@ -87,6 +87,7 @@ PRE_UNINSTALL = :
 POST_UNINSTALL = :
 build_triplet = @build@
 host_triplet = @host@
+@ENABLE_PYTHON_TRUE@am__append_1 = tc_diag
 subdir = src/tools/tc_utils
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/configure.ac
@@ -151,7 +152,8 @@ am__define_uniq_tagged_files = \
   done | $(am__uniquify_input)`
 ETAGS = etags
 CTAGS = ctags
-DIST_SUBDIRS = $(SUBDIRS)
+DIST_SUBDIRS = tc_dland tc_pairs tc_stat tc_gen tc_rmw rmw_analysis \
+	tc_diag
 am__DIST_COMMON = $(srcdir)/Makefile.in
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 am__relativize = \
@@ -323,15 +325,8 @@ target_alias = @target_alias@
 top_build_prefix = @top_build_prefix@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
-SUBDIRS = tc_dland \
-	tc_pairs \
-	tc_stat \
-	tc_gen \
-	tc_rmw \
-	rmw_analysis \
-	tc_diag \
-	tc_stat
-
+SUBDIRS = tc_dland tc_pairs tc_stat tc_gen tc_rmw rmw_analysis tc_stat \
+	$(am__append_1)
 MAINTAINERCLEANFILES = Makefile.in
 all: all-recursive