Fix solink and add a postsolink hook (use the hook for android strip)

build/toolchain/android/BUILD.gn

Index: build/toolchain/android/BUILD.gn
diff --git a/build/toolchain/android/BUILD.gn b/build/toolchain/android/BUILD.gn
index 78a6c9f97bf77d83ca6c60f590849983708ac41b..c927b37f0c91c18bbcb085de77dd1d79533157ee 100644
--- a/build/toolchain/android/BUILD.gn
+++ b/build/toolchain/android/BUILD.gn
@@ -48,6 +48,12 @@ template("android_gcc_toolchain") {
 
     toolchain_os = "android"
     toolchain_cpu_arch = invoker.toolchain_cpu_arch
+
+    android_strip = "${tool_prefix}strip"
+    mkdir_command = "mkdir -p lib.stripped"
+    strip_command = "$android_strip --strip-unneeded -o lib.stripped/\$soname.tmp \$lib"
+    replace_command = "if ! cmp -s lib.stripped/\${soname}.tmp lib.stripped/\${soname}; then mv lib.stripped/\${soname}.tmp lib.stripped/\${soname}; fi"
+    postsolink = "$mkdir_command && $strip_command && $replace_command"
   }
 }