Merge branch 'jw/make-arflags-customizable' into maint

The Makefile always runs the library archiver with hardcoded "crs"
options, which was inconvenient for exotic platforms on which
people want to use programs with totally different set of command
line options.

* jw/make-arflags-customizable:
  Makefile: allow $(ARFLAGS) specified from the command line

Makefile

@@ -375,6 +375,9 @@ ALL_CFLAGS = $(CPPFLAGS) $(CFLAGS)
 ALL_LDFLAGS = $(LDFLAGS)
 STRIP ?= strip
 
+# Create as necessary, replace existing, make ranlib unneeded.
+ARFLAGS = rcs
+
 # Among the variables below, these:
 #   gitexecdir
 #   template_dir
@@ -1995,13 +1998,13 @@ $(REMOTE_CURL_PRIMARY): remote-curl.o http.o http-walker.o GIT-LDFLAGS $(GITLIBS
 		$(LIBS) $(CURL_LIBCURL) $(EXPAT_LIBEXPAT)
 
 $(LIB_FILE): $(LIB_OBJS)
-	$(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $^
+	$(QUIET_AR)$(RM) $@ && $(AR) $(ARFLAGS) $@ $^
 
 $(XDIFF_LIB): $(XDIFF_OBJS)
-	$(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $^
+	$(QUIET_AR)$(RM) $@ && $(AR) $(ARFLAGS) $@ $^
 
 $(VCSSVN_LIB): $(VCSSVN_OBJS)
-	$(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $^
+	$(QUIET_AR)$(RM) $@ && $(AR) $(ARFLAGS) $@ $^
 
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