modified libyuv.gyp so that it no longer depends on libjpeg.gyp, which does not exist anymore.

BUG=libyuv:666
TESTED= unittests built and passed with jpeg disabled.
R=kjellander@chromium.org

Review-Url: https://codereview.chromium.org/2585373002 .

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1637
+Version: 1638
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1637
+#define LIBYUV_VERSION 1638
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_

libyuv.gyp

@@ -18,7 +18,8 @@
   },
   'variables': {
     'use_system_libjpeg%': 0,
-    'libyuv_disable_jpeg%': 0,
+    # Can be enabled if your jpeg has GYP support.
+    'libyuv_disable_jpeg%': 1,
     # 'chromium_code' treats libyuv as internal and increases warning level.
     'chromium_code': 1,
     # clang compiler default variable usable by other apps that include libyuv.

libyuv_test.gyp

@@ -8,7 +8,8 @@
 
 {
   'variables': {
-    'libyuv_disable_jpeg%': 0,
+    # Can be enabled if your jpeg has GYP support.
+    'libyuv_disable_jpeg%': 1,
     'mips_msa%': 0,  # Default to msa off.
   },
   'targets': [