This patch enables building memusagestat with BIND_NOW enabled.

Upstream, this change was part of the following commit...

commit f9b645b4b0a10c43753296ce3fa40053fa44606a
Author: Mike Frysinger <vapier@gentoo.org>
Date:   Wed Apr 24 13:32:22 2019 +0200

    memusagestat: use local glibc when linking [BZ #18465]

...but since that commit cannot be backported to RHEL-7, this patch
adds only the BIND_NOW linker flag at the appropriate place instead.

diff --git a/malloc/Makefile b/malloc/Makefile
index 476208cf43d211c9..992cec6b03115a76 100644
--- a/malloc/Makefile
+++ b/malloc/Makefile
@@ -142,7 +142,7 @@ lib := memusagestat
 include $(patsubst %,$(..)cppflags-iterator.mk,$(cpp-srcs-left))
 
 $(objpfx)memusagestat: $(memusagestat-modules:%=$(objpfx)%.o)
-	$(LINK.o) -o $@ $^ $(libgd-LDFLAGS) -lgd -lpng -lz -lm
+	$(LINK.o) -Wl,-z,now -o $@ $^ $(libgd-LDFLAGS) -lgd -lpng -lz -lm
 
 include ../Rules