[PATCH] gdb: Add missing single quotation mark in README

[Tiezhu Yang]

Maybe forgot to add a single quotation mark for --with-system-zlib
in commit 7f0bd4202c23 ("Update gdb's configure instructions"), just
add it.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 gdb/README | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/README b/gdb/README
index 763089bb02d..d85c37d5d17 100644
--- a/gdb/README
+++ b/gdb/README
@@ -451,7 +451,7 @@ more obscure GDB `configure' options are not listed here.
      library supplied as part of GDB.  Readline 7 or newer is required;
      this is enforced by the build system.
 
-`--with-system-zlib
+`--with-system-zlib'
      Use the zlib library installed on the host, rather than the
      library supplied as part of GDB.
 
-- 
2.42.0