glibc: make compilation more pure

Remove datetime from nscd.

pkgs/development/libraries/glibc/2.19/common.nix

@@ -61,6 +61,14 @@ stdenv.mkDerivation ({
 
       ./cve-2014-0475.patch
       ./cve-2014-5119.patch
+
+      /* Remove references to the compilation date.  */
+      ./glibc-remove-date-from-compilation-banner.patch
+
+      /* Remove the date and time from nscd.  It is used as a protocol
+         compatibility check, but we assume nix takes care of that for
+         us. */
+      ./glibc-remove-datetime-from-nscd.patch
     ];
 
   postPatch = ''

pkgs/development/libraries/glibc/2.19/glibc-remove-date-from-compilation-banner.patch

@@ -0,0 +1,12 @@
+diff -ur glibc-2.17.orig/csu/Makefile glibc-2.17/csu/Makefile
+--- glibc-2.17.orig/csu/Makefile	2012-12-25 04:02:13.000000000 +0100
++++ glibc-2.17/csu/Makefile	2013-08-19 16:01:57.132378550 +0200
+@@ -172,7 +172,7 @@
+ 		     os=Linux; \
+ 		   fi; \
+ 		   printf '"Compiled on a %s %s system on %s.\\n"\n' \
+-			  "$$os" "$$version" "`date +%Y-%m-%d`";; \
++			  "$$os" "$$version";; \
+ 	   *) ;; \
+ 	 esac; \
+ 	 files="$(all-Banner-files)";				\

pkgs/development/libraries/glibc/2.19/glibc-remove-datetime-from-nscd.patch

@@ -0,0 +1,11 @@
+--- a/nscd/nscd_stat.c	2014-04-08 20:35:24.253715420 +0200
++++ b/nscd/nscd_stat.c	2014-04-08 20:38:32.526634400 +0200
+@@ -37,7 +37,7 @@
+ 
+ 
+ /* We use this to make sure the receiver is the same.  */
+-static const char compilation[21] = __DATE__ " " __TIME__;
++static const char compilation[21] = "Thu  1 1970 00:00:01"; /* __DATE__ " " __TIME__; */
+ 
+ /* Statistic data for one database.  */
+ struct dbstat