Remove *_FOR_TARGET variables from TARGET_CONFIGURE_OPTS

Those variables are not standard.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/Makefile.in

@@ -193,11 +193,6 @@ TARGET_CONFIGURE_OPTS=PATH=$(TARGET_PATH) \
 		CXXFLAGS_FOR_BUILD="$(HOST_CXXFLAGS)" \
 		LDFLAGS_FOR_BUILD="$(HOST_LDFLAGS)" \
 		FCFLAGS_FOR_BUILD="$(HOST_FCFLAGS)" \
-		AR_FOR_TARGET="$(TARGET_AR)" \
-		AS_FOR_TARGET="$(TARGET_AS)" \
-		CC_FOR_TARGET="$(TARGET_CC)" \
-		LD_FOR_TARGET="$(TARGET_LD)" \
-		NM_FOR_TARGET="$(TARGET_NM)" \
 		DEFAULT_ASSEMBLER="$(TARGET_AS)" \
 		DEFAULT_LINKER="$(TARGET_LD)" \
 		PKG_CONFIG_SYSROOT_DIR="$(STAGING_DIR)" \