Added configure check for spawnvp().

diff --git a/configure b/configure
index 54aabb9..b04d091 100755
--- a/configure
+++ b/configure
@@ -13616,6 +13616,7 @@
 
 
 
+
 for ac_func in \
 	_lwp_create \
 	_lwp_self \
@@ -13656,6 +13657,7 @@
 	settimeofday \
 	sigaltstack \
 	snprintf \
+	spawnvp \
 	statfs \
 	strcasecmp \
 	strerror \