Use SSE on amd64 (where it works), not on i386 (where it throws compiler errors)

--- a/wfview.pro
+++ b/wfview.pro
@@ -35,8 +35,8 @@ DEFINES += QCUSTOMPLOT_COMPILE_LIBRARY
 
 
 # These defines are used for the resampler
-equals(QT_ARCH, i386): DEFINES += USE_SSE
-equals(QT_ARCH, i386): DEFINES += USE_SSE2
+equals(QT_ARCH, x86_64): DEFINES += USE_SSE
+equals(QT_ARCH, x86_64): DEFINES += USE_SSE2
 equals(QT_ARCH, arm): DEFINES += USE_NEON
 DEFINES += OUTSIDE_SPEEX
 DEFINES += RANDOM_PREFIX=wf
