Rename macro to avoid namespace conflicts.

Change-Id: Iecf00f67dcd6250d6919875cee79a600fccab039

internal/ceres/stringprintf.h

diff --git a/internal/ceres/stringprintf.h b/internal/ceres/stringprintf.h
index 30b974e..f2f907a 100644
--- a/internal/ceres/stringprintf.h
+++ b/internal/ceres/stringprintf.h
@@ -54,34 +54,34 @@
 // N.B.: As the GCC manual states, "[s]ince non-static C++ methods
 // have an implicit 'this' argument, the arguments of such methods
 // should be counted from two, not one."
-#define PRINTF_ATTRIBUTE(string_index, first_to_check) \
+#define CERES_PRINTF_ATTRIBUTE(string_index, first_to_check) \
     __attribute__((__format__ (__printf__, string_index, first_to_check)))
-#define SCANF_ATTRIBUTE(string_index, first_to_check) \
+#define CERES_SCANF_ATTRIBUTE(string_index, first_to_check) \
     __attribute__((__format__ (__scanf__, string_index, first_to_check)))
 #else
-#define PRINTF_ATTRIBUTE(string_index, first_to_check)
+#define CERES_PRINTF_ATTRIBUTE(string_index, first_to_check)
 #endif
 
 // Return a C++ string.
 extern string StringPrintf(const char* format, ...)
     // Tell the compiler to do printf format string checking.
-    PRINTF_ATTRIBUTE(1,2);
+    CERES_PRINTF_ATTRIBUTE(1,2);
 
 // Store result into a supplied string and return it.
 extern const string& SStringPrintf(string* dst, const char* format, ...)
     // Tell the compiler to do printf format string checking.
-    PRINTF_ATTRIBUTE(2,3);
+    CERES_PRINTF_ATTRIBUTE(2,3);
 
 // Append result to a supplied string.
 extern void StringAppendF(string* dst, const char* format, ...)
     // Tell the compiler to do printf format string checking.
-    PRINTF_ATTRIBUTE(2,3);
+    CERES_PRINTF_ATTRIBUTE(2,3);
 
 // Lower-level routine that takes a va_list and appends to a specified string.
 // All other routines are just convenience wrappers around it.
 extern void StringAppendV(string* dst, const char* format, va_list ap);
 
-#undef PRINTF_ATTRIBUTE
+#undef CERES_PRINTF_ATTRIBUTE
 
 }  // namespace internal
 }  // namespace ceres