Fix building on musl libc.

src/common/linux/dump_symbols.cc

 // Copyright (c) 2011 Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 830 matching lines @@
   // number appended to the end of the file identifier; this isn't
   // really used or necessary on other platforms, but be consistent.
   id_no_dash += '0';
   return id_no_dash;
 }
 
 // Return the non-directory portion of FILENAME: the portion after the
 // last slash, or the whole filename if there are no slashes.
 string BaseFileName(const string &filename) {
   // Lots of copies!  basename's behavior is less than ideal.
-  char* c_filename = strdup(filename.c_str());
-  string base = basename(c_filename);
-  free(c_filename);
+  const char *c_filename = filename.c_str();
+  const char *p = strrchr(c_filename, '/');
+  string base = p ? p+1 : c_filename;
   return base;
 }
 
 template<typename ElfClass>
 bool SanitizeDebugFile(const typename ElfClass::Ehdr* debug_elf_header,
                        const string& debuglink_file,
                        const string& obj_filename,
                        const char* obj_file_architecture,
                        const bool obj_file_is_big_endian) {
   const char* debug_architecture =
@@ skipping 136 matching lines @@
   MmapWrapper map_wrapper;
   void* elf_header = NULL;
   if (!LoadELF(obj_file, &map_wrapper, &elf_header))
     return false;
 
   return ReadSymbolDataInternal(reinterpret_cast<uint8_t*>(elf_header),
                                 obj_file, debug_dirs, options, module);
 }
 
 }  // namespace google_breakpad