Remove install.c CPP file

src/install.c

@@ -1,39 +0,0 @@
-#include "install.h"
-
-int
-backup()
-{
-  struct stat sb;
-
-  const std::string bkp = hd + _prefix + "_backup/";
-
-  struct stat stat_dir;
-  if (stat(bkp.c_str(), &stat_dir) != 0)
-  {
-    mkdir(bkp.c_str(), 0700);
-  }
-
-  for (auto &i : _vec)
-  {
-    const std::string source_file = hd + _prefix + "/" + i;
-    const std::string dest_file = bkp + i;
-
-    std::cout << "Backing up " << _prefix << "/" << i << "\n";
-
-    int source = open(source_file.c_str(), O_RDONLY, 0);
-    int dest = open(dest_file.c_str(), O_WRONLY | O_CREAT /*| O_TRUNC/**/, 0644);
-
-    // struct required, rationale: function stat() exists also
-    struct stat stat_source;
-    fstat(source, &stat_source);
-    sendfile(dest, source, 0, stat_source.st_size);
-
-    close(source);
-    close(dest);
-
-    if (access(dest_file.c_str(), F_OK) != 0)
-    {
-      throw ExceptionHandler(CUSTOM_ERROR, "Backing up " + dest_file + " failed!");
-    }
-  }
-}