Don't set -pie for windows modules

Adding -pie to LOCAL_LDFLAGS for host linking leaves it around
when doing the host cross Windows linking, resulting in a warning:
clang-7: warning: argument unused during compilation: '-pie' [-Wunused-command-line-argument]

Add it later in binary.mk after the flags have been copied to the
single-use my_ldflags.

Bug: 115776263
Test: m checkbuild
Change-Id: I70d71fa1ec6445631dc7e89ef61927a3304375e2