textproc/randlm: fix build on powerpc*

rdtsc() is available only on amd64 / i386.

textproc/randlm/Makefile

@@ -14,7 +14,6 @@ LICENSE_FILE=	${WRKSRC}/COPYING
 
 BROKEN_aarch64=		fails to compile: invalid output constraint =a in assembler
 BROKEN_armv6=		fails to compile: invalid output constraint =a in assembler
-BROKEN_powerpc64=	fails to compile: 'itr' does not name a type
 BROKEN_riscv64=		fails to compile: invalid output constraint =a in assembler
 
 BUILD_DEPENDS=	${LOCALBASE}/include/google/sparse_hash_map:devel/sparsehash

textproc/randlm/files/patch-src-LDHT-Util.h

@@ -1,5 +1,5 @@
---- src/LDHT/Util.h.orig	2012-03-30 14:53:05.000000000 +0400
-+++ src/LDHT/Util.h	2014-08-30 18:08:50.000000000 +0400
+--- src/LDHT/Util.h.orig	2012-03-30 10:53:05 UTC
++++ src/LDHT/Util.h
 @@ -10,6 +10,10 @@
  #include <cstdlib>
  #include <cstring>
@@ -11,3 +11,21 @@
 
  #define V(expr) std::cerr << __FILE__ << ":" \
                            << __LINE__ << " " \
+@@ -43,6 +47,9 @@ class Util { (public)
+     static uint64_t hash(uint64_t a, uint64_t b, uint64_t P, uint8_t* e);
+     static uint64_t hash(uint64_t a, uint64_t b, uint64_t P, uint64_t e);
+     static inline uint64_t rdtsc() {
++#if defined(__powerpc__)
++        return __builtin_readcyclecounter();
++#else
+         uint32_t lo, hi;
+         __asm__ __volatile__(
+                 "xorl %%eax,%%eax\n"
+@@ -52,6 +59,7 @@ class Util { (public)
+                 :
+                 : "%ebx", "%ecx");
+         return static_cast<uint64_t>(hi) << 32 | lo;
++#endif
+     };
+ };
+