build: Delete freestanding-toolchain's .git dir from tarballs

Author: Mintsuki

GNUmakefile.in

@@ -305,6 +305,7 @@ dist:
 	cp -r '$(call SHESCAPE,$(SRCDIR))'/.git '$(call SHESCAPE,$(BUILDDIR))'/"$(DIST_OUTPUT)"/
 	cd '$(call SHESCAPE,$(BUILDDIR))'/"$(DIST_OUTPUT)" && git checkout .
 	cd '$(call SHESCAPE,$(BUILDDIR))'/"$(DIST_OUTPUT)" && ./bootstrap
+	rm -rf '$(call SHESCAPE,$(BUILDDIR))'/"$(DIST_OUTPUT)/build-aux/freestanding-toolchain/.git"
 	rm -rf '$(call SHESCAPE,$(BUILDDIR))'/"$(DIST_OUTPUT)/common/flanterm/.git"
 	rm -rf '$(call SHESCAPE,$(BUILDDIR))'/"$(DIST_OUTPUT)/common/flanterm/.gitignore"
 	rm -rf '$(call SHESCAPE,$(BUILDDIR))'/"$(DIST_OUTPUT)/freestnd-c-hdrs/.git"