Remove -lc++ link and document -fno-exceptions

linux.mk

Index: linux.mk
diff --git a/linux.mk b/linux.mk
index 60d516696414e290e927cc4dc1554b9da089726b..625cde9daed0a28c179015f014202e8b02fd4f4b 100644
--- a/linux.mk
+++ b/linux.mk
@@ -74,8 +74,10 @@ psnr: util/psnr.cc
 	$(CXX) $(CXXFLAGS) -Iutil/ -o $@ util/psnr.cc util/psnr_main.cc util/ssim.cc
 
 # A C test utility that uses libyuv conversion from C.
+# gcc 4.4 and older require -fno-exceptions to avoid link error on __gxx_personality_v0
+# CC=gcc-4.4 CXXFLAGS=-fno-exceptions CXX=g++-4.4 make -f linux.mk
 cpuid: util/cpuid.c libyuv.a
-	$(CC) $(CFLAGS) -o $@ util/cpuid.c libyuv.a -lc++
+	$(CC) $(CFLAGS) -o $@ util/cpuid.c libyuv.a
 
 clean:
 	/bin/rm -f source/*.o *.ii *.s libyuv.a convert cpuid psnr