Remove largefile

Otherwise it doesn't compile in uClibc without largefile.

If the toolchain does support largefile, it will still work on large files
anyway.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
---
Upstream status: mail sent to apw@rossby.metr.ou.edu
---
diff -rup stress-1.0.4.orig/src/Makefile.am stress-1.0.4/src/Makefile.am
--- stress-1.0.4.orig/src/Makefile.am	2009-12-03 02:04:05.000000000 +0100
+++ stress-1.0.4/src/Makefile.am	2012-05-04 23:09:48.229842463 +0200
@@ -1,7 +1,5 @@
 MAINTAINERCLEANFILES = Makefile.in
 
-AM_CFLAGS = -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
-
 bin_PROGRAMS = stress
 stress_SOURCES = stress.c
 stress_MANS = stress.1