glpk: update to 4.57

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

libs/glpk/Makefile

@@ -8,12 +8,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=glpk
-PKG_VERSION:=4.55
+PKG_VERSION:=4.57
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=@GNU/$(PKG_NAME)
-PKG_MD5SUM:=c632a7a631b8aed02e28eafcd99477f
+PKG_MD5SUM:=237531a54f73155842f8defe51aedb0f
 
 PKG_LICENSE:=GPL-3.0
 PKG_LICENSE_FILES:=COPYING