package/wpa_supplicant: drop dangling WPA_SUPPLICANT_{LDFLAGS, MAKE_ENV}

Commit "0340b45da0 wpa_supplicant: bump to version 1.0" from 2012
converted the package to use the generic infra, but added a bogus
WPA_SUPPLICANT_LDFLAGS end left a dangling WPA_SUPPLICANT_MAKE_ENV.

Drop the symbols that are not used since 2012.

Cc: Matt Weber <matthew.weber@collins.com>
Cc: Sergey Matyukevich <geomatsi@gmail.com>
Cc: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/wpa_supplicant/wpa_supplicant.mk

@@ -13,7 +13,6 @@ WPA_SUPPLICANT_CONFIG = $(WPA_SUPPLICANT_DIR)/wpa_supplicant/.config
 WPA_SUPPLICANT_SUBDIR = wpa_supplicant
 WPA_SUPPLICANT_DBUS_SERVICE = fi.w1.wpa_supplicant1
 WPA_SUPPLICANT_CFLAGS = $(TARGET_CFLAGS) -I$(STAGING_DIR)/usr/include/libnl3/
-WPA_SUPPLICANT_LDFLAGS = $(TARGET_LDFLAGS)
 WPA_SUPPLICANT_SELINUX_MODULES = networkmanager
 
 # install the wpa_client library
@@ -157,9 +156,6 @@ endif
 
 ifeq ($(BR2_PACKAGE_WPA_SUPPLICANT_DBUS),y)
 WPA_SUPPLICANT_DEPENDENCIES += host-pkgconf dbus
-WPA_SUPPLICANT_MAKE_ENV = \
-	PKG_CONFIG_SYSROOT_DIR="$(STAGING_DIR)" \
-	PKG_CONFIG_PATH="$(STAGING_DIR)/usr/lib/pkgconfig"
 WPA_SUPPLICANT_CONFIG_ENABLE += CONFIG_CTRL_IFACE_DBUS_NEW
 define WPA_SUPPLICANT_INSTALL_DBUS_NEW
 	$(INSTALL) -m 0644 -D \