Enable libprocessgroup on host bionic

Bug: 31559095

Test: Build
Change-Id: I1ee9fb492137c6c16f0d02586393837616127972
diff --git a/libprocessgroup/Android.bp b/libprocessgroup/Android.bp
index 37e4dbf..1974f2c 100644
--- a/libprocessgroup/Android.bp
+++ b/libprocessgroup/Android.bp
@@ -1,6 +1,7 @@
 cc_library {
     srcs: ["processgroup.cpp"],
     name: "libprocessgroup",
+    defaults: ["linux_bionic_supported"],
     shared_libs: ["libbase"],
     export_include_dirs: ["include"],
     cflags: [