ci/meson: Set -Db_lundef=false when building with sanitisers under Clang

Clang cannot handle building shared libraries with sanitizers and
-Wl,--no-undefined (set by default unless explicitly disabled with
-Db_lundef=false).

This commit prefixes CI in case shared libraries are built with
sanitisers.

Signed-off-by: Zurab Kvachadze <zurabid2016@gmail.com>

Author: BalkanMadman

.github/workflows/ci.yml

@@ -643,11 +643,14 @@ jobs:
           - name: clang+sanitize
             args: >-
               "-Db_sanitize=address,undefined"
+              "-Db_lundef=false"
             extra_envs:
               CC: clang
               CXX: clang++
           - name: clang+msan
-            args: -Db_sanitize=memory
+            args: >-
+              "-Db_sanitize=memory"
+              "-Db_lundef=false"
             extra_envs:
               CC: clang
               CXX: clang++
@@ -657,6 +660,7 @@ jobs:
           - name: clang-cl+sanitize
             args: >-
               "-Db_sanitize=address,undefined"
+              "-Db_lundef=false"
             extra_envs:
               CC: clang-cl
               CXX: clang-cl