iw: use $(TARGET_MAKE_ENV) when calling $(MAKE)

Signed-off-by: Gustavo Zacarias <gustavo.zacarias@free-electrons.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/iw/iw.mk

@@ -11,7 +11,9 @@ IW_LICENSE = ISC
 IW_LICENSE_FILES = COPYING
 IW_DEPENDENCIES = host-pkgconf libnl
 IW_MAKE_OPTS = CC="$(TARGET_CC)" LD="$(TARGET_LD)" LDFLAGS="$(TARGET_LDFLAGS)"
-IW_MAKE_ENV = PKG_CONFIG="$(HOST_DIR)/usr/bin/pkg-config" \
+IW_MAKE_ENV = \
+	$(TARGET_MAKE_ENV) \
+	PKG_CONFIG="$(HOST_DIR)/usr/bin/pkg-config" \
 	GIT_DIR=$(IW_DIR)
 
 define IW_BUILD_CMDS