Remove host target of ICU on Android

icu.gyp

Index: icu.gyp
diff --git a/icu.gyp b/icu.gyp
index 30b3d88d85acddc8b7f0f31a31e17fad0ec32c8d..4a5bddcb5a2f302b66cd0e777b7ff116383f7fda 100644
--- a/icu.gyp
+++ b/icu.gyp
@@ -67,12 +67,7 @@
             [ 'OS == "win" or OS == "mac" or OS == "android"', {
               'sources!': ['linux/icudt46l_dat.S'],
             }],
-            [ 'OS == "android"', {
-              # Android builds ImageDiff for host, which has a dependency on
-              # newwtf so needs to be able to build this target for host as
-              # well.
-              'toolsets': ['host', 'target'],
-            }, { # 'OS != "android"',
+            [ 'OS != "android"', {
               'sources!': ['android/icudt46l_dat.S'],
             }],
             [ 'OS != "mac"', {
@@ -289,12 +284,6 @@
                 '-frtti',
               ],
             }],
-            ['OS == "android"', {
-              # Android builds ImageDiff for host, which has a dependency on
-              # newwtf so needs to be able to build this target for host as
-              # well.
-              'toolsets': ['host', 'target'],
-            }],
             ['OS == "mac"', {
               'xcode_settings': {
                 'GCC_ENABLE_CPP_RTTI': 'YES',       # -frtti
@@ -533,12 +522,6 @@
                 '-frtti',
               ],
             }],
-            ['OS == "android"', {
-              # Android builds ImageDiff for host, which has a dependency on
-              # newwtf so needs to be able to build this target for host as
-              # well.
-              'toolsets': ['host', 'target'],
-            }],
             ['OS == "mac"', {
               'xcode_settings': {
                 'GCC_ENABLE_CPP_RTTI': 'YES',       # -frtti