wolfssl: Fix hostapd build with wolfssl 4.6.0

This fixes the following build problem in hostapd:
mipsel-openwrt-linux-musl/bin/ld: /builder/shared-workdir/build/tmp/ccN4Wwer.ltrans7.ltrans.o: in function `crypto_ec_point_add':
<artificial>:(.text.crypto_ec_point_add+0x170): undefined reference to `ecc_projective_add_point'
mipsel-openwrt-linux-musl/bin/ld: <artificial>:(.text.crypto_ec_point_add+0x18c): undefined reference to `ecc_map'
mipsel-openwrt-linux-musl/bin/ld: /builder/shared-workdir/build/tmp/ccN4Wwer.ltrans7.ltrans.o: in function `crypto_ec_point_to_bin':
<artificial>:(.text.crypto_ec_point_to_bin+0x40): undefined reference to `ecc_map'

Fixes: ba40da9045f7 ("wolfssl: Update to v4.6.0-stable")
Signed-off-by: Hauke Mehrtens <[email protected]>

package/libs/wolfssl/patches/110-Fix-linking-against-hostapd-with-LTO.patch

@@ -0,0 +1,25 @@
+From 391ecbd647c121300dc7dcf209e412ccb7b8d432 Mon Sep 17 00:00:00 2001
+From: Hauke Mehrtens <[email protected]>
+Date: Fri, 1 Jan 2021 21:57:56 +0100
+Subject: [PATCH] Fix linking against hostapd with LTO
+
+When running LTO on wolfssl the ecc_map() function is removed from the
+binary by GCC 8.4.0. This function is used by multiple functions from
+the crypto_wolfssl.c implementation of hostapd master.
+
+Fixes: 780e8a4619b6 ("Fixes for building `--enable-wpas=small` with WPA Supplicant v2.7.")
+Signed-off-by: Hauke Mehrtens <[email protected]>
+---
+ configure.ac | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/configure.ac
++++ b/configure.ac
+@@ -947,6 +947,7 @@ then
+     AM_CFLAGS="$AM_CFLAGS -DOPENSSL_EXTRA_X509_SMALL"
+ 
+     AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_PUBLIC_MP"
++    AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_PUBLIC_ECC_ADD_DBL"
+     AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_DER_LOAD"
+     AM_CFLAGS="$AM_CFLAGS -DATOMIC_USER"
+     AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_KEY_GEN"