openocd: Fix build with gcc10/-fno-common

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-devtools/openocd/openocd_git.bb

@@ -10,6 +10,7 @@ SRC_URI = " \
     git://repo.or.cz/r/jimtcl.git;protocol=http;destsuffix=git/jimtcl;name=jimtcl \
     git://repo.or.cz/r/libjaylink.git;protocol=http;destsuffix=git/src/jtag/drivers/libjaylink;name=libjaylink \
     file://0001-Do-not-include-syscrtl.h-with-glibc.patch \
+    file://0001-bitbang-Make-bitbang_swd-extern-definition.patch \
 "
 
 SRCREV_FORMAT = "openocd"