cmake: Fix linking with LLVM/Terminfo

cmake: Fix linking with LLVM/Terminfo

DEBUG: [  9%] Building CXX object backend/src/CMakeFiles/gbe_bin_generater.dir/gbe_bin_generater.cpp.o
DEBUG: Linking CXX executable gbe_bin_generater
DEBUG: /usr/lib64/llvm/libLLVMSupport.a(Process.o): In function `llvm::sys::Process::FileDescriptorHasColors(int)':
DEBUG: (.text+0x717): undefined reference to `setupterm'
DEBUG: /usr/lib64/llvm/libLLVMSupport.a(Process.o): In function `llvm::sys::Process::FileDescriptorHasColors(int)':
DEBUG: (.text+0x727): undefined reference to `tigetnum'
DEBUG: /usr/lib64/llvm/libLLVMSupport.a(Process.o): In function `llvm::sys::Process::FileDescriptorHasColors(int)':
DEBUG: (.text+0x730): undefined reference to `set_curterm'
DEBUG: /usr/lib64/llvm/libLLVMSupport.a(Process.o): In function `llvm::sys::Process::FileDescriptorHasColors(int)':
DEBUG: (.text+0x738): undefined reference to `del_curterm'

Signed-off-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>
Reviewed-by: Zhigang Gong <zhigang.gong@linux.intel.com>