[libc++] Fix incorrect install component for the libc++ linker script (#171663)

This patch fixes the name of the install component for the libc++ linker
script. Every other target mentions the cxx component, and that one
mentions libcxx. I believe that was a typo in 4bd3d16c2d62.

NOKEYCHECK=True
GitOrigin-RevId: dec52b2c4791e74058c05d0a85405725989480c6
1 file changed