build_info: Add glibc_version for Linux

Library/Homebrew/extend/os/linux/development_tools.rb

@@ -19,5 +19,15 @@ class DevelopmentTools
     def default_compiler
       :gcc
     end
+
+    def build_system_info
+      brewed_glibc_version = begin
+        Formula["glibc"].any_installed_version
+      rescue FormulaUnavailableError
+        nil
+      end
+      glibc_version = brewed_glibc_version || OS::Linux::Glibc.system_version
+      generic_build_system_info.merge "glibc_version" => glibc_version
+    end
   end
 end