implement support for musl/ppc64

Signed-off-by: Khem Raj <raj.khem@gmail.com>
--- a/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h
+++ b/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h
@@ -58,7 +58,7 @@ Copyright (c) 2006, 2015, Percona and/or
 #include <stdint.h>
 #include <sys/time.h>
 #include <time.h>
-#if defined(__powerpc__)
+#if defined(__powerpc__) && defined(__GLIBC__)
 #include <sys/platform/ppc.h>
 #endif
 
@@ -131,8 +131,12 @@ static inline tokutime_t toku_time_now(v
   uint64_t result;
   __asm __volatile__("mrs %[rt], cntvct_el0" : [ rt ] "=r"(result));
   return result;
-#elif defined(__powerpc__)
+#elif defined(__powerpc__) && defined(__GLIBC__)
   return __ppc_get_timebase();
+#elif defined(__powerpc64__) || defined(__ppc64__)
+  uint64_t result;
+  asm volatile("mfspr %0, 268" : "=r"(result));
+  return result;
 #elif defined(__riscv) // RISC-V
 #if __riscv_xlen == 32
   uint32_t lo, hi0, hi1;