meta-digi-arm: trustfence-cst: fix native recipe and Makefile

This package is native only, this patch ensures it can only be built
natively and fix the following problems:
* Add openssl-native rather than openssl to the dependencies.
* Use the $(CC) $(LDFLAGS) and $(CFLAGS) that Yocto provides to avoid a
  compilation error.

Signed-off-by: Diaz de Grenu, Jose <Jose.DiazdeGrenu@digi.com>

meta-digi-arm/recipes-bsp/trustfence-cst/trustfence-cst-2.3.2/Makefile

@@ -1,7 +1,6 @@
 TARGET = linux64/cst
 LIBS = -lfrontend -lcrypto
-CC = gcc
-CFLAGS = -g -Wall
+CFLAGS += -g -Wall
 
 .PHONY: default all clean
 
@@ -18,7 +17,7 @@ LIBS_PATH = linux64/lib
 .PRECIOUS: $(TARGET) $(OBJECTS)
 
 $(TARGET): $(OBJECTS)
-	$(CC) $(OBJECTS) $(CFLAGS) -L $(LIBS_PATH) $(LIBS) -I $(HEADERS) -o $@
+	$(CC) $(OBJECTS) $(CFLAGS) $(LDFLAGS) -L $(LIBS_PATH) $(LIBS) -I $(HEADERS) -o $@
 
 clean:
 	-rm -f *.o $(TARGET)

meta-digi-arm/recipes-bsp/trustfence-cst/trustfence-cst-native_2.3.2.bb

@@ -3,9 +3,11 @@ DESCRIPTION = "Provides software code signing support designed for use with i.MX
 HOMEPAGE = "https://www.nxp.com/webapp/Download?colCode=IMX_CST_TOOL"
 LICENSE = "CLOSED"
 
-DEPENDS = "openssl"
+DEPENDS = "openssl-native"
 
-S= "${WORKDIR}/cst-${PV}"
+S = "${WORKDIR}/cst-${PV}"
+
+inherit native
 
 SRC_URI = " \
 	${@base_conditional('TRUSTFENCE_SIGN', '1', 'file://cst-${PV}.tar.gz', '', d)} \
@@ -32,5 +34,3 @@ do_install () {
 	install -m 0755 ca/v3_ca.cnf ${D}${bindir}/v3_ca.cnf
 	install -m 0755 ca/v3_usr.cnf ${D}${bindir}/v3_usr.cnf
 }
-
-BBCLASSEXTEND = "native"