update disktest



git-svn-id: http://test.kernel.org/svn/autotest/trunk@456 592f7852-d20e-0410-864c-8624ca9c26a4
diff --git a/client/tests/disktest/disktest.py b/client/tests/disktest/disktest.py
index 2da1bac..480bb04 100755
--- a/client/tests/disktest/disktest.py
+++ b/client/tests/disktest/disktest.py
@@ -9,7 +9,8 @@
 		os.chdir(self.bindir)
 		system('cp disktest.c src/')
 		os.chdir(self.srcdir)
-		system('cc disktest.c -D_FILE_OFFSET_BITS=64 -o disktest')
+		cflags = '-D_FILE_OFFSET_BITS=64 -D _GNU_SOURCE'
+		system('cc disktest.c ' + cflags + ' -o disktest')
 
 
 	def execute(self, iterations = 1):