Add extra warnings to match what Android uses.

platform_tools/android/gyp/dependencies.gypi

Index: platform_tools/android/gyp/dependencies.gypi
diff --git a/platform_tools/android/gyp/dependencies.gypi b/platform_tools/android/gyp/dependencies.gypi
index 82763bea115eb285515a853a723f786a2fa15715..bb0db7184bbc8e2d2cb822002609c634e27b221e 100644
--- a/platform_tools/android/gyp/dependencies.gypi
+++ b/platform_tools/android/gyp/dependencies.gypi
@@ -42,9 +42,7 @@
         '../third_party/externals/expat/lib',
       ],
       'cflags': [
-        '-Wall',
-        '-Wmissing-prototypes',
-        '-Wstrict-prototypes',
+        '-w',
         '-fexceptions',
         '-DHAVE_EXPAT_CONFIG_H',
       ],
@@ -66,12 +64,9 @@
         '../third_party/externals/gif',
       ],
       'cflags': [
-        '-Wno-format',
+        '-w',
         '-DHAVE_CONFIG_H',
       ],
-      'cflags!': [
-        '-Wall',
-      ],
       'direct_dependent_settings': {
         'include_dirs': [
           '../third_party/externals/gif',
@@ -104,11 +99,9 @@
         '../third_party/externals/png',
       ],
       'cflags': [
+        '-w',
         '-fvisibility=hidden',
       ],
-      'cflags!': [
-        '-Wall',
-      ],
       'link_settings': {
         'libraries': [
           '-lz',