ibrcommon: fix build on musl

Build error:
```
make[6]: Entering directory `/home/sandu/work/openwrt/build_dir/target-mips_34kc_musl-1.1.11/ibrcommon-1.0.1/ibrcommon/data'
  CXX      BLOB.lo
  CXX      ConfigFile.lo
  CXX      File.lo
File.cpp: In member function 'std::__cxx11::string ibrcommon::File::getBasename() const':
File.cpp:229:44: error: 'basename' was not declared in this scope
   return std::string(basename(_path.c_str()));
                                            ^
make[6]: *** [File.lo] Error 1
```

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

0 files changed, 0 insertions, 0 deletions