Sort SUBDIRS variable in src/bin/Makefile

The previous order appears to have been historically grown randomness.

src/bin/Makefile

@@ -13,8 +13,16 @@ subdir = src/bin
 top_builddir = ../..
 include $(top_builddir)/src/Makefile.global
 
-SUBDIRS = initdb pg_ctl pg_dump \
-	psql scripts pg_config pg_controldata pg_resetxlog pg_basebackup
+SUBDIRS = \
+	initdb \
+	pg_basebackup \
+	pg_config \
+	pg_controldata \
+	pg_ctl \
+	pg_dump \
+	pg_resetxlog \
+	psql \
+	scripts
 
 ifeq ($(PORTNAME), win32)
 SUBDIRS += pgevent