Redefine is_linux to not include Android in the GN build.

build/config/BUILDCONFIG.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # =============================================================================
 # BUILD FLAGS
 # =============================================================================
 #
 # This block lists input arguments to the build, along with their default
 # values. GN requires listing them explicitly so it can validate input and have
@@ skipping 79 matching lines @@
 # OS DEFINITIONS
 # =============================================================================
 #
 # We set these various is_FOO booleans for convenience in writing OS-based
 # conditions.
 #
 # - is_android, is_chromeos, is_ios, and is_win should be obvious.
 # - is_mac is set only for desktop Mac. It is not set on iOS.
 # - is_posix is true for mac and any Unix-like system (basically everything
 #   except Windows).
-# - is_linux is true for any Linux variant including Android and ChromeOS.
+# - is_linux is true for desktop Linux and ChromeOS, but not Android (which is
+#   generally too different despite being based on the Linux kernel).
 #
 # Do not add more is_* variants here for random lesser-used Unix systems like
 # aix or one of the BSDs. If you need to check these, just check the os value
 # directly.
 
 if (os == "win") {
   is_android = false
   is_chromeos = false
   is_ios = false
   is_linux = false
@@ skipping 13 matching lines @@
   is_nacl = false
   is_posix = true
   is_win = false
   if (!is_clang) {
     is_clang = true  # Always use clang on Mac.
   }
 } else if (os == "android") {
   is_android = true
   is_chromeos = false
   is_ios = false
-  is_linux = true
+  is_linux = false
   is_mac = false
   is_nacl = false
   is_posix = true
   is_win = false
 } else if (os == "chromeos") {
   is_android = false
   is_chromeos = true
   is_ios = false
   is_linux = true
   is_mac = false
@@ skipping 248 matching lines @@
     "//build/config/win:console",
   ]
 }
 
 set_defaults("executable") {
   configs = native_compiler_configs
   if (is_win) {
     configs += windows_linker_configs
   } else if (is_mac) {
     configs += [ "//build/config/mac:mac_dynamic_flags" ]
-  } else if (is_linux) {
+  } else if (is_linux || is_android) {
     configs += [ "//build/config/linux:executable_ldconfig" ]
   }
 }
 
 set_defaults("static_library") {
   configs = native_compiler_configs
 }
 
 set_defaults("shared_library") {
   configs = native_compiler_configs
@@ skipping 34 matching lines @@
 } else if (is_android) {
   host_toolchain = "//build/toolchain/linux:$build_cpu_arch"
   set_default_toolchain("//build/toolchain/android:$cpu_arch")
 } else if (is_linux) {
   host_toolchain = "//build/toolchain/linux:$build_cpu_arch"
   set_default_toolchain("//build/toolchain/linux:$cpu_arch")
 } else if (is_mac || is_ios) {
   host_toolchain = "//build/toolchain/mac:clang"
   set_default_toolchain(host_toolchain)
 }