[PATCH 3/4] azure: Add the missing build dependency for MSYS2 build

[Bin Meng]

Package 'flex' is needed when building the U-Boot host tool, but
is currently missing in the build dependency in the CI pipeline.

This is to prepare switching to an installer based CI build.

Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
---

 .azure-pipelines.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.azure-pipelines.yml b/.azure-pipelines.yml
index 69d4358..9b88aa6 100644
--- a/.azure-pipelines.yml
+++ b/.azure-pipelines.yml
@@ -22,7 +22,7 @@ jobs:
           %CD:~0,2%\msys64\usr\bin\bash -lc "pacman --noconfirm -Syyuu"
         displayName: 'Update MSYS2'
       - script: |
-          %CD:~0,2%\msys64\usr\bin\bash -lc "pacman --noconfirm --needed -S make gcc bison diffutils openssl-devel"
+          %CD:~0,2%\msys64\usr\bin\bash -lc "pacman --noconfirm --needed -S make gcc bison flex diffutils openssl-devel"
         displayName: 'Install Toolchain'
       - script: |
           echo make tools-only_defconfig tools-only NO_SDL=1 > build-tools.sh
-- 
2.7.4