[PATCH libdrm] Add missing <strings.h> includes

[Greg Hackmann]

A couple of files use ffs() without explicitly including strings.h.
Some systems will pull in ffs()'s declaration through another header
anyway, but not when compiling against bionic in AOSP master.

Signed-off-by: Greg Hackmann <ghackmann at google.com>
---
 nouveau/nouveau.c         | 1 +
 tests/modetest/modetest.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/nouveau/nouveau.c b/nouveau/nouveau.c
index 2d95b74..22e0f80 100644
--- a/nouveau/nouveau.c
+++ b/nouveau/nouveau.c
@@ -30,6 +30,7 @@
 #include <stdlib.h>
 #include <stdint.h>
 #include <string.h>
+#include <strings.h>
 #include <stdbool.h>
 #include <assert.h>
 #include <errno.h>
diff --git a/tests/modetest/modetest.c b/tests/modetest/modetest.c
index 53dfe05..63d2059 100644
--- a/tests/modetest/modetest.c
+++ b/tests/modetest/modetest.c
@@ -50,6 +50,7 @@
 #include <inttypes.h>
 #include <unistd.h>
 #include <string.h>
+#include <strings.h>
 #include <errno.h>
 #include <sys/poll.h>
 #include <sys/time.h>
-- 
2.2.0.rc0.207.ga3a616c