libcoap: Build linker symbol file explicitly

Since we autoreconf, it should be better to build the linker map file
too, which requires ctags during build. This is otherwise flagged as
error by lld linker where we specify a linker symbol file on cmdline
but the file is not there.

Fixes
| libtool:   error: symbol file './libcoap-3.sym' does not exist

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-networking/recipes-devtools/libcoap/libcoap_4.3.1.bb

@@ -16,6 +16,8 @@ S = "${WORKDIR}/git"
 
 inherit autotools manpages pkgconfig ptest
 
+DEPENDS += "ctags-native"
+
 PACKAGECONFIG ?= "\
     async openssl tcp \
     ${@bb.utils.contains('PTEST_ENABLED', '1', 'tests', '', d)} \
@@ -42,6 +44,10 @@ python () {
 
 export SGML_CATALOG_FILES="file://${STAGING_ETCDIR_NATIVE}/xml/catalog"
 
+do_compile:prepend() {
+    oe_runmake update-map-file
+}
+
 do_install_ptest () {
 	install -d ${D}${PTEST_PATH}
 	install -m 0755 ${WORKDIR}/run-ptest ${D}${PTEST_PATH}/run-ptest