configure: clean temporary executable files even on Windows

Signed-off-by: malc <av1474@comtv.ru>
diff --git a/configure b/configure
index 7c7804b..ca6d45c 100755
--- a/configure
+++ b/configure
@@ -13,7 +13,7 @@
 
 TMPC="${TMPDIR1}/qemu-conf-${RANDOM}-$$-${RANDOM}.c"
 TMPO="${TMPDIR1}/qemu-conf-${RANDOM}-$$-${RANDOM}.o"
-TMPE="${TMPDIR1}/qemu-conf-${RANDOM}-$$-${RANDOM}"
+TMPE="${TMPDIR1}/qemu-conf-${RANDOM}-$$-${RANDOM}.exe"
 
 trap "rm -f $TMPC $TMPO $TMPE ; exit" 0 2 3 15