extconf: fix regexps for use-system-libraries

Author: dm9pZCAq

ext/rugged/extconf.rb

@@ -71,12 +71,12 @@ def self.run_cmake(timeout, args)
   major = minor = nil
 
   File.readlines(File.join(LIBGIT2_DIR, "include", "git2", "version.h")).each do |line|
-    if !major && (matches = line.match(/^#define LIBGIT2_VER_MAJOR ([0-9]+)$/))
+    if !major && (matches = line.match(/^#define LIBGIT2_VER_MAJOR\s+([0-9]+)$/))
       major = matches[1]
       next
     end
 
-    if !minor && (matches = line.match(/^#define LIBGIT2_VER_MINOR ([0-9]+)$/))
+    if !minor && (matches = line.match(/^#define LIBGIT2_VER_MINOR\s+([0-9]+)$/))
       minor = matches[1]
       next
     end