fix typo for glibcxx debug

9 jobs for cgg in 5 minutes and 37 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #83422
VS2015
VS2015-32-bit

00:01:27

passed #83421
VS2015
VS2015-64-bit

00:01:40

passed #83420
VS2017
VS2017-32-bit

00:01:28

passed #83419
VS2015
VS2017-64-bit

00:01:32

passed #83416
Linux
clang-c++11

00:05:37

passed #83418
Linux
cppcheck

00:03:25

passed #83423
Linux
doc

00:00:10

passed #83415
Linux
gcc-c++11

00:05:25

passed #83417
Apple
macos-c++11

00:02:59