Microblaze does not support stack-protector:

| cc1: warning: '-fstack-protector' not supported for this target
| ninja: build stopped: subcommand failed.

Signed-off-by: Mark Hatle <mark.hatle@xilinx.com>

Index: git/meson.build
===================================================================
--- git.orig/meson.build
+++ git/meson.build
@@ -403,7 +403,6 @@ possible_link_flags = [
         '-Wl,--fatal-warnings',
         '-Wl,-z,now',
         '-Wl,-z,relro',
-        '-fstack-protector',
 ]
 
 if get_option('b_sanitize') == 'none'
@@ -423,8 +422,6 @@ possible_cc_flags = possible_common_cc_f
         '-fdiagnostics-show-option',
         '-fno-common',
         '-fno-strict-aliasing',
-        '-fstack-protector',
-        '-fstack-protector-strong',
         '-fvisibility=hidden',
         '--param=ssp-buffer-size=4',
 ]
