Restore --without-simd option for testing purposes


git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@80 632fc199-4ca6-4c93-a231-07263d6284db
diff --git a/Makefile.am b/Makefile.am
index dbe29e0..81c6d6b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -17,10 +17,18 @@
 
 libturbojpeg_la_SOURCES = $(libjpeg_la_SOURCES) turbojpegl.c turbojpeg.h
 
+if WITH_SIMD
+
 SUBDIRS = simd
 libjpeg_la_LIBADD = simd/libsimd.la
 libturbojpeg_la_LIBADD = simd/libsimd.la
 
+else
+
+libjpeg_la_SOURCES += jsimd_none.c
+
+endif
+
 TSTHDRS = rrutil.h rrtimer.h
 
 noinst_PROGRAMS = jpgtest jpegut cjpeg djpeg