hostapd: pass global linker options to CLI tools

hostapd: pass global linker options to CLI tools

The CLI tools hostapd_cli and wpa_cli are compiled with
`TARGET_LDFLAGS_C` rather than the standard `TARGET_LDFLAGS`.
This variable is empty, leading to global linker options not being
applied.

Set this variable equal to `TARGET_LDFLAGS` right after the package.mk
include to make sure global linker options are applied, but local options
such as linking to crypto libraries are not.

Signed-off-by: Matthias Van Parys <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20345
Signed-off-by: Hauke Mehrtens <[email protected]>