overwrite GNU_SITE for now

Signed-off-by: Justin Kolberg <[email protected]>

toolchains/config.mak

@@ -10,3 +10,10 @@ COMMON_CONFIG += CFLAGS="-g0 -Os" CXXFLAGS="-g0 -Os" LDFLAGS="-s"
 GCC_CONFIG += --enable-languages=c
 # add -nv to download command for tidy CI output
 DL_CMD = wget -nv -c -O
+
+# GNU_SITE defaults to https://ftpmirror.gnu.org/gnu which will redirect to
+# another mirror. At the time of this commit, one of the mirrors that is
+# frequently being picked has an expired certificate. Remove or comment out the
+# following line once https://mirror.us-midwest-1.nexcess.net has a valid
+# certificate.
+GNU_SITE = https://mirror.team-cymru.com/gnu