picocom: force target LDFLAGS

This allows a static build of picocom when BR2_STATIC_LIBS=y but the toolchain
provides static and shared libraries.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit add51b89bfb5ebe7b533e14714088a4d3912c9a0)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/picocom/picocom.mk

@@ -10,7 +10,8 @@ PICOCOM_LICENSE = GPLv2+
 PICOCOM_LICENSE_FILES = LICENSE.txt
 
 define PICOCOM_BUILD_CMDS
-	$(TARGET_MAKE_ENV) $(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D)
+	$(TARGET_MAKE_ENV) $(TARGET_CONFIGURE_OPTS) $(MAKE) \
+		LDFLAGS="$(TARGET_LDFLAGS)" -C $(@D)
 endef
 
 define PICOCOM_INSTALL_TARGET_CMDS