Add platform needed by python_binary_host.

Test: USE_BAZEL_ANALYSIS=1 m genfunctosyscallnrs
Test: USE_BAZEL_ANALYSIS=1 m func_to_syscall_nrs
Test: USE_BAZEL_ANALYSIS=1 m libseccomp_policy
Bug: 201094425, 197135289

Change-Id: Ica457ee71e2c1c2f9c950c014f85cf8e546205e2
diff --git a/platforms/BUILD.bazel b/platforms/BUILD.bazel
index 0318738..46e1e6f 100644
--- a/platforms/BUILD.bazel
+++ b/platforms/BUILD.bazel
@@ -39,6 +39,14 @@
     ],
 )
 
+platform(
+    name = "linux_glibc_x86_64",
+    constraint_values = [
+        "//build/bazel/platforms/arch:x86_64",
+        "//build/bazel/platforms/os:linux",
+    ],
+)
+
 # linux_bionic is the OS for the Linux kernel plus the Bionic libc runtime, but
 # without the rest of Android.
 platform(