Revert "Make strlcpy available in folly" (D2062632)

Summary:
Reverting diff to fix the build.

Test Plan: contbuild rule that failed to build is okay now

Reviewed By: ldbrandy@fb.com

folly/Demangle.cpp

@@ -20,7 +20,6 @@
 #include <string.h>
 
 #include <folly/Malloc.h>
-#include <folly/String.h>
 
 #if FOLLY_HAVE_CPLUS_DEMANGLE_V3_CALLBACK
 # include <cxxabi.h>
@@ -56,6 +55,21 @@ extern "C" int cplus_demangle_v3_callback(
 
 #endif
 
+namespace {
+
+// glibc doesn't have strlcpy
+size_t my_strlcpy(char* dest, const char* src, size_t size) {
+  size_t len = strlen(src);
+  if (size != 0) {
+    size_t n = std::min(len, size - 1);  // always null terminate!
+    memcpy(dest, src, n);
+    dest[n] = '\0';
+  }
+  return len;
+}
+
+}  // namespace
+
 namespace folly {
 
 #if FOLLY_HAVE_CPLUS_DEMANGLE_V3_CALLBACK
@@ -105,7 +119,7 @@ size_t demangle(const char* name, char* out, size_t outSize) {
       demangleCallback,
       &dbuf);
   if (status == 0) {  // failed, return original
-    return folly::strlcpy(out, name, outSize);
+    return my_strlcpy(out, name, outSize);
   }
   if (outSize != 0) {
     *dbuf.dest = '\0';
@@ -120,7 +134,7 @@ fbstring demangle(const char* name) {
 }
 
 size_t demangle(const char* name, char* out, size_t outSize) {
-  return folly::strlcpy(out, name, outSize);
+  return my_strlcpy(out, name, outSize);
 }
 
 #endif

folly/String.cpp

@@ -492,16 +492,6 @@ void toLowerAscii(char* str, size_t length) {
   }
 }
 
-size_t strlcpy(char* dest, const char* const src, size_t size) {
-  size_t len = strlen(src);
-  if (size != 0) {
-    size_t n = std::min(len, size - 1);  // always null terminate!
-    memcpy(dest, src, n);
-    dest[n] = '\0';
-  }
-  return len;
-}
-
 namespace detail {
 
 size_t hexDumpLine(const void* ptr, size_t offset, size_t size,

folly/String.h

@@ -569,9 +569,6 @@ inline void toLowerAscii(MutableStringPiece str) {
   toLowerAscii(str.begin(), str.size());
 }
 
-// glibc doesn't have strlcpy
-size_t strlcpy(char* dest, const char* const src, size_t size);
-
 } // namespace folly
 
 // Hook into boost's type traits