openssl: Remove -Werror=format-nonliteral from compiler flags

openssl's opt tool uses a non-literal format string for
help texts.
This has been verified to be harmless in 1.1.1k (the "unsafe"
use of a printf style function happens only with hardcoded,
safe strings).

Removing -Werror=format-nonliteral here allows us to use
-Werror=format-nonliteral globally in OPTIMIZE_FOR=security mode
while keeping openssl building.

Signed-off-by: Bernhard Rosenkränzer <bernhard.rosenkraenzer.ext@huawei.com>

meta-ohos-core/recipes-connectivity/openssl/openssl_%.bbappend

+# SPDX-FileCopyrightText: Huawei Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+# openssl's opt tool uses a non-literal format string for
+# help texts.
+# This has been verified to be harmless in 1.1.1k (the "unsafe"
+# use of a printf style function happens only with hardcoded,
+# safe strings).
+#
+# Removing -Werror=format-nonliteral here allows us to use
+# -Werror=format-nonliteral globally in OPTIMIZE_FOR=security mode
+# while keeping openssl building.
+
+TARGET_CFLAGS_remove = "-Werror=format-nonliteral"