util/extract-strings: Use autotools syntax for building

Always refer to it as "extract-strings$(EXEEXT)" where needed to take
cross-compilation into account.

https://bugzilla.gnome.org/show_bug.cgi?id=731013

gtk/Makefile.am

@@ -1336,7 +1336,7 @@ template_headers = $(COMPOSITE_TEMPLATES:.ui=.ui.h)
 
 %.ui.h: %.ui
 	$(AM_V_GEN) mkdir -p $(dir $@) \
-	&& $(top_builddir)/util/extract-strings$(BUILD_EXEEXT) $< > $@
+	&& $(top_builddir)/util/extract-strings$(EXEEXT) $< > $@
 
 #
 # rules to generate built sources
@@ -1566,7 +1566,6 @@ distclean-local:
 	if test $(srcdir) != .; then \
 	  rm -f $(MAINTAINERCLEANFILES); \
 	  rm -rf stock-icons; \
-	  rm -f extract-strings$(EXEEXT); \
 	  rm -f $(template_headers); \
 	fi
 

gtk/inspector/Makefile.am

@@ -114,10 +114,8 @@ templates = 				\
 
 template_headers = $(templates:.ui=.ui.h)
 
-extract_strings = $(top_builddir)/util/extract-strings
-
 %.ui.h : %.ui 
-	$(AM_V_GEN) $(extract_strings) $< > $@
+	$(AM_V_GEN) $(top_builddir)/util/extract-strings$(EXEEXT) $< > $@
 
 EXTRA_DIST += 				\
 	inspector.gresource.xml 	\

util/Makefile.am

@@ -1,13 +1,9 @@
 # The extract_strings tool is a build utility that runs on the build system.
-extract_strings_sources = extract-strings.c
-extract_strings_cppflags =
-extract_strings_cflags = $(GLIB_CFLAGS_FOR_BUILD)
-extract_strings_ldadd = $(GLIB_LIBS_FOR_BUILD)
-
-extract-strings$(EXEEXT): $(extract_strings_sources)
-	@rm -f extract-strings
-	$(AM_V_CCLD)$(CC_FOR_BUILD) $(extract_strings_cppflags) $(CPPFLAGS_FOR_BUILD) $(extract_strings_cflags) $(CFLAGS_FOR_BUILD) $^ $(LDFLAGS_FOR_BUILD) $(extract_strings_ldadd) $(LIBS_FOR_BUILD) -o $@
 
 noinst_PROGRAMS = extract-strings
 
+extract_strings_SOURCES = extract-strings.c
+extract_strings_CFLAGS = $(GLIB_CFLAGS_FOR_BUILD)
+extract_strings_LDADD = $(GLIB_LIBS_FOR_BUILD)
+
 -include $(top_srcdir)/git.mk