GN(android): Default libs logic from runtime_library -> default_libs

build/config/BUILD.gn

Index: build/config/BUILD.gn
diff --git a/build/config/BUILD.gn b/build/config/BUILD.gn
index 18bd77509a5c045f587cbf0c1235fd61174b450c..195293b801b0a22bfc11112348bc373e4f868206 100644
--- a/build/config/BUILD.gn
+++ b/build/config/BUILD.gn
@@ -363,15 +363,7 @@ config("default_libs") {
       # target that needs it.
     ]
   } else if (is_android) {
-    # Android uses -nostdlib so we need to add even libc here.
     libs = [
-      # TODO(brettw) write a version of this, hopefully we can express this
-      # without forking out to GCC just to get the library name. The android
-      # toolchain directory should probably be extracted into a .gni file that
-      # this file and the android toolchain .gn file can share.
-      #   # Manually link the libgcc.a that the cross compiler uses.
-      #   '<!(<(android_toolchain)/*-gcc -print-libgcc-file-name)',
-      "c",
       "dl",
       "m",
     ]