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 <c869b0bfe2cf1da26c2efd33f6d6d74ddcbbdd2b@gmail.com>
Reviewed-by: Zhigang Gong <e04a7b9b70b1e4c6318cf117dcd1a9056e14b97a@linux.intel.com>

wdv4758h/beignet,freedesktop-unofficial-mirror/beignet,ignatenkobrain/beignet,ignatenkobrain/beignet,freedesktop-unofficial-mirror/beignet,freedesktop-unofficial-mirror/beignet,ignatenkobrain/beignet,zhenyw/beignet,wdv4758h/beignet,wdv4758h/beignet,wdv4758h/beignet,zhenyw/beignet,zhenyw/beignet,wdv4758h/beignet,freedesktop-unofficial-mirror/beignet,zhenyw/beignet,ignatenkobrain/beignet,zhenyw/beignet,ignatenkobrain/beignet