[source] u-boot-envtools: fix building with glibc

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/?p=source.git;a=commitdiff;h=c8580f51ba8c9eef787bef7b3e259860858c0f62

commit c8580f51ba8c9eef787bef7b3e259860858c0f62
Author: Josua Mayer <josua.mayer97 at gmail.com>
AuthorDate: Fri Jun 24 12:46:49 2016 +0200

    u-boot-envtools: fix building with glibc
    
    tools/env/fw_env.c misses to include stdint.h.
    Apparently musl doesn't mind and includes this header by default,
    but glibc does not and causes the build to fail.
    
    Signed-off-by: Josua Mayer <josua.mayer97 at gmail.com>
---
 .../uboot-envtools/patches/400-u-boot-2015.10-stdint.patch  | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/package/boot/uboot-envtools/patches/400-u-boot-2015.10-stdint.patch b/package/boot/uboot-envtools/patches/400-u-boot-2015.10-stdint.patch
new file mode 100644
index 0000000..395674f
--- /dev/null
+++ b/package/boot/uboot-envtools/patches/400-u-boot-2015.10-stdint.patch
@@ -0,0 +1,13 @@
+diff -Naur u-boot-2015.10.orig/tools/env/fw_env.c u-boot-2015.10/tools/env/fw_env.c
+--- u-boot-2015.10.orig/tools/env/fw_env.c	2016-06-24 12:42:31.152391850 +0200
++++ u-boot-2015.10/tools/env/fw_env.c	2016-06-24 12:42:59.080391754 +0200
+@@ -21,7 +21,8 @@
+ #include <sys/types.h>
+ #include <sys/ioctl.h>
+ #include <sys/stat.h>
+-#include <unistd.h>
++#include <unistd.h>
++#include <stdint.h>
+ 
+ #ifdef MTD_OLD
+ # include <stdint.h>