dpdk: Fix detection of vhost_cuse in dpdk rte_config.h

Dpdk allows users to create a config that includes other config files and
then override values.

Eg.
defconfig_x86_64-native_vhost_cuse-linuxapp-gcc:

CONFIG_RTE_BUILD_COMBINE_LIBS=y
CONFIG_RTE_BUILD_SHARED_LIB=n
CONFIG_RTE_LIBRTE_VHOST=y
CONFIG_RTE_LIBRTE_VHOST_USER=n

This allows you to have both a vhostuser and vhostcuse config in the same
source tree without the need to replicate everything in those config files
just to change a couple of settings. The resultant .config file has all of
the settings from the included files with the updated settings at the end.
The resultant rte_config.h contains multiple undefs and defines for the
overridden settings.

Eg.
  > grep RTE_LIBRTE_VHOST_USER x86_64-native_vhost_cuse-linuxapp-gcc/include/rte_config.h
  #undef RTE_LIBRTE_VHOST_USER
  #define RTE_LIBRTE_VHOST_USER 1
  #undef RTE_LIBRTE_VHOST_USER

The current mechanism to detect the RTE_LIBRTE_VHOST_USER setting merely
greps the rte_config.h file for the string "define RTE_LIBRTE_VHOST_USER 1"
rather than the final setting of RTE_LIBRTE_VHOST_USER. The following patch
changes this test to detect the final setting of RTE_LIBRTE_VHOST_USER.

Signed-off-by: Gary Mussar <gmussar@ciena.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com

acinclude.m4

@@ -175,7 +175,11 @@ AC_DEFUN([OVS_CHECK_DPDK], [
     DPDK_LIB="-lintel_dpdk"
     DPDK_EXTRA_LIB=""
 
-    OVS_GREP_IFELSE([$RTE_SDK/include/rte_config.h], [define RTE_LIBRTE_VHOST_USER 1],
+    AC_COMPILE_IFELSE(
+      [AC_LANG_PROGRAM([#include <$RTE_SDK/include/rte_config.h>
+#if !RTE_LIBRTE_VHOST_USER
+#error
+#endif], [])],
                     [], [AC_DEFINE([VHOST_CUSE], [1], [DPDK vhost-cuse support enabled, vhost-user disabled.])
                          DPDK_EXTRA_LIB="-lfuse"])