autoconf: updated pa_cross_compile

Probably unnecessary, but be more aggressive in defanging WINE.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

autoconf/m4/pa_cross_compile.m4

diff --git a/autoconf/m4/pa_cross_compile.m4 b/autoconf/m4/pa_cross_compile.m4
index 8de1a7d..f082973 100644
--- a/autoconf/m4/pa_cross_compile.m4
+++ b/autoconf/m4/pa_cross_compile.m4
@@ -31,6 +31,10 @@
  # Disable WINE
  WINELOADER=/dev/null
  export WINELOADER
+ WINESERVER=/dev/null
+ export WINESERVER
+ WINEPREFIX=/dev/null
+ export WINEPREFIX
 
  AC_CANONICAL_BUILD
  AC_CANONICAL_HOST