use memcpy instead of strcpy to set rpath

Since we already no the size, this is faster.

Author: Mic92

src/patchelf.cc

@@ -1457,7 +1457,7 @@ void ElfFile<ElfFileParamNames>::modifyRPath(RPathOp op,
 
     /* Zero out the previous rpath to prevent retained dependencies in
        Nix. */
-    unsigned int rpathSize = 0;
+    size_t rpathSize = 0;
     if (rpath) {
         rpathSize = strlen(rpath);
         memset(rpath, 'X', rpathSize);
@@ -1466,8 +1466,9 @@ void ElfFile<ElfFileParamNames>::modifyRPath(RPathOp op,
     debug("new rpath is '%s'\n", newRPath.c_str());
 
 
-    if (newRPath.size() <= rpathSize) {
-        strcpy(rpath, newRPath.c_str());
+    size_t newSize = newRPath.size();
+    if (newSize <= rpathSize) {
+        memcpy(rpath, newRPath.c_str(), newSize + 1);
         return;
     }