We do have process-shared mutexes.

But until 468c8086e6f28b9342d3f89ed89f185ab5bb775a, bionic didn't set the
_POSIX_THREAD_PROCESS_SHARED #define that fio's configure script relied on.

Bug: N/A
Test: builds, no longer warns about not having this feature
Change-Id: Iffe254fd9ea1e4193b98df543dad77820722ece3
diff --git a/Android.bp b/Android.bp
index e37de66..e2daa40 100644
--- a/Android.bp
+++ b/Android.bp
@@ -12,6 +12,7 @@
         "-DCONFIG_LINUX_FALLOCATE",
         "-DCONFIG_LINUX_SPLICE",
         "-DCONFIG_LITTLE_ENDIAN",
+        "-DCONFIG_PSHARED",
         "-DCONFIG_RLIMIT_MEMLOCK",
         "-DCONFIG_RUSAGE_THREAD",
         "-DCONFIG_SCHED_IDLE",