sanitizer_common: fix format string in LibIgnore

uptr should be printed with %zu.

Differential Revision: https://reviews.llvm.org/D108106

compiler-rt/lib/sanitizer_common/sanitizer_libignore.cpp

@@ -24,7 +24,7 @@ LibIgnore::LibIgnore(LinkerInitialized) {
 void LibIgnore::AddIgnoredLibrary(const char *name_templ) {
   Lock lock(&mutex_);
   if (count_ >= kMaxLibs) {
-    Report("%s: too many ignored libraries (max: %lu)\n", SanitizerToolName,
+    Report("%s: too many ignored libraries (max: %zu)\n", SanitizerToolName,
            kMaxLibs);
     Die();
   }