mongodb: Pass OBJCOPY to scons so it does not use it from host

Fixes
objcopy: Unable to recognise the format of the input file `build/opt/mongo/mongos'

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Vincent Prince <vincent.prince.fr@gmail.com.com>

meta-oe/dynamic-layers/meta-python/recipes-dbs/mongodb/mongodb_git.bb

@@ -60,6 +60,7 @@ EXTRA_OESCONS = "PREFIX=${prefix} \
                  CXXFLAGS='${CXXFLAGS}' \
                  TARGET_ARCH=${TARGET_ARCH} \
                  MONGO_VERSION=${PV} \
+                 OBJCOPY=${OBJCOPY} \
                  --ssl \
                  --disable-warnings-as-errors \
                  --use-system-zlib \