Re-revert "Merge: glibc: 2.24 -> 2.25"

This reverts commit 55cc7700e9.
I hope most problems have been solved.  /cc #22874.

pkgs/development/libraries/glibc/common.nix

@@ -10,8 +10,8 @@ cross:
 , preConfigure ? "", ... }@args:
 
 let
-  version = "2.24";
-  sha256 = "1ghzp41ryvsqxn4rhrm8r25wc33m2jf8zrcc1pj3jxyk8ad9a0by";
+  version = "2.25";
+  sha256 = "067bd9bb3390e79aa45911537d13c3721f1d9d3769931a30c2681bfee66f23a0";
 in
 
 assert cross != null -> gccCross != null;
@@ -138,7 +138,7 @@ stdenv.mkDerivation ({
     lib.optionalString (cross != null) "-${cross.config}";
 
   src = fetchurl {
-    url = "mirror://gnu/glibc/glibc-${version}.tar.gz";
+    url = "mirror://gnu/glibc/glibc-${version}.tar.xz";
     inherit sha256;
   };
 

pkgs/development/libraries/glibc/default.nix

@@ -81,7 +81,7 @@ in
       # to bootstrap-tools; on cross-arm this stripping would break objects.
       if [ -z "$crossConfig" ]; then
         for i in "$out"/lib/*.a; do
-            strip -S "$i"
+            [ "$i" = "$out/lib/libm.a" ] || strip -S "$i"
         done
       fi