make: In ndn-cpp-config.h, to avoid polluting the global name space, generate NDN_CPP_HAVE_BOOST_FUNCTION etc. instead of HAVE_BOOST_FUNCTION, etc.
diff --git a/ndn-cpp/c/util/ndn_memory.c b/ndn-cpp/c/util/ndn_memory.c
index ba3fc2e..8051864 100644
--- a/ndn-cpp/c/util/ndn_memory.c
+++ b/ndn-cpp/c/util/ndn_memory.c
@@ -6,7 +6,7 @@
 
 #include "ndn_memory.h"
 
-#if !HAVE_MEMCMP
+#if !NDN_CPP_HAVE_MEMCMP
 int ndn_memcmp(uint8_t *buf1, uint8_t *buf2, size_t len)
 {
   size_t i;
@@ -24,7 +24,7 @@
 int ndn_memcmp_stub_to_avoid_empty_file_warning = 0;
 #endif
 
-#if !HAVE_MEMCPY
+#if !NDN_CPP_HAVE_MEMCPY
 void ndn_memcpy(uint8_t *dest, uint8_t *src, size_t len)
 {
   size_t i;
@@ -36,7 +36,7 @@
 int ndn_memcpy_stub_to_avoid_empty_file_warning = 0;
 #endif
 
-#if !HAVE_MEMSET
+#if !NDN_CPP_HAVE_MEMSET
 void ndn_memset(uint8_t *dest, int val, size_t len)
 {
   size_t i;