openssl: passing cflags to configure

openssl sets additional cflags in its configuration script. We need to
make it aware of our custom cflags to avoid adding conflicting cflags.

Signed-off-by: Jitao Lu <dianlujitao@gmail.com>

package/libs/openssl/Makefile

@@ -11,7 +11,7 @@ PKG_NAME:=openssl
 PKG_BASE:=1.1.1
 PKG_BUGFIX:=u
 PKG_VERSION:=$(PKG_BASE)$(PKG_BUGFIX)
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_USE_MIPS16:=0
 
 PKG_BUILD_PARALLEL:=1
@@ -334,6 +334,7 @@ define Build/Configure
 			--libdir=lib \
 			--openssldir=/etc/ssl \
 			--cross-compile-prefix="$(TARGET_CROSS)" \
+			$(TARGET_CFLAGS) \
 			$(TARGET_CPPFLAGS) \
 			$(TARGET_LDFLAGS) \
 			$(OPENSSL_OPTIONS) && \