Fix workflow dependencies

Author: treecase

.github/workflows/cmake-multi-platform.yml

@@ -54,6 +54,7 @@ jobs:
         pacboy: >-
           cmake:p
           glew:p
+          glm:p
           gtkmm3:p
           lua:p
           ninja:p
@@ -63,7 +64,7 @@ jobs:
       if: ${{ matrix.os == 'ubuntu-latest' }}
       run: |
           sudo apt-get update
-          sudo apt-get install bison flex libfl-dev libglew-dev libgtkmm-3.0-dev liblua5.4-dev
+          sudo apt-get install bison flex libfl-dev libglew-dev libglm-dev libgtkmm-3.0-dev liblua5.4-dev
 
     # Disable autocrlf for MSYS2 compatibility.
     - run: git config --global core.autocrlf input