[CMake] Bootstrap failed under Ubuntu

[Steven Van Ingelgem]

cmSystemTools.cxx:(.text+0x62f): undefined reference to
`cmELF::cmELF(char const*)'
cmSystemTools.cxx:(.text+0x63d): undefined reference to `cmELF::GetRPath()'
cmSystemTools.cxx:(.text+0x65a): undefined reference to `cmELF::GetRunPath()'
cmSystemTools.cxx:(.text+0xa0f): undefined reference to `cmELF::~cmELF()'
cmSystemTools.cxx:(.text+0xa28): undefined reference to `cmELF::~cmELF()'
cmSystemTools.o: In function
`cmSystemTools::GuessLibrarySOName(std::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&,
std::basic_string<char, std::char_traits<char>, std::allocator<char>
>&)':
cmSystemTools.cxx:(.text+0xd71): undefined reference to
`cmELF::cmELF(char const*)'
cmSystemTools.cxx:(.text+0xd92): undefined reference to
`cmELF::GetSOName(std::basic_string<char, std::char_traits<char>,
std::allocator<char> >&)'
cmSystemTools.cxx:(.text+0xf64): undefined reference to `cmELF::~cmELF()'
cmSystemTools.cxx:(.text+0xf7d): undefined reference to `cmELF::~cmELF()'
cmSystemTools.o: In function `cmELF::operator bool() const':
cmSystemTools.cxx:(.text._ZNK5cmELFcvbEv[cmELF::operator bool()
const]+0xd): undefined reference to `cmELF::Valid() const'



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