SCP: sprint_val comma bug, GH: Remnant symlinks

- Fix comma separator code segmentation fault: "ndigit - 3" can become a
  very large unsigned number for ndigit < 3.

- dir_cmd: Allocate WildName from heap to reduce stack pressure.

- Github CI/CD: Remnant symlink issue reappeared, afflicting the
  makefile-based build. For better or worse, the workaround is now
  dependent on specific Python versions that must be removed, unlinked
  and any remnant symlinks that HomeBrew decided it needed to install in
  /usr/local/bin. The Python upgrade is triggered by the sdl2_ttf
  package.

  According to the Github image maintainers, this is an old, known issue
  in macOS images that originates inside of Homebrew.

.github/workflows/build.yml

@@ -35,10 +35,26 @@ jobs:
           - scelbi 3b2 i701 i704 i7010 i7070 i7080 i7090 sigma uc15 i650 sel32 intel-mds ibm1130
     steps:
       - uses: actions/checkout@v3
-      - name: Install dependencies
+      ## Workaround for remnant symlinks in /usr/local pointing back to
+      ## macOS frameworks.
+      ##
+      ## Future: Will have to keep an eye on SDL_ttf's Python dependency
+      ## so that the correct/appropriate Python version is removed.
+      - name: Remnant symlink cleanup (macOS)
+        if: ${{runner.os == 'macOS'}}
+        run: |
+          brew unlink python@3 || true
+          brew uninstall --ignore-dependencies python@3 || true
+          brew unlink python@3.12 || true
+          brew uninstall --ignore-dependencies python@3.12 || true
+          for f in $(find /usr/local/bin -type l -print); do \
+            (readlink $f | grep -q -s "/Library") && echo Removing "$f" && rm -f "$f"; \
+          done || exit 0
+      ## Install our regular dependencies.
+      - name: Install dependencies (macOS)
         if: ${{runner.os == 'macOS'}}
         run: sh -ex .travis/deps.sh osx
-      - name: Install dependencies
+      - name: Install dependencies (Linux)
         if: ${{runner.os == 'Linux'}}
         run: sh -ex .travis/deps.sh linux
       - name: makefile build

.github/workflows/cmake-builds.yml

@@ -46,15 +46,22 @@ jobs:
         os: [macos-12, macos-11]
     steps:
     - uses: actions/checkout@v3
-    ## For some reason, the macos-11 image has symlinks to /Library in /usr/local/bin
-    - name: Clean /usr/local/bin symlinks
+    ## Workaround for remnant symlinks in /usr/local pointing back to
+    ## macOS frameworks.
+    ##
+    ## Future: Will have to keep an eye on SDL_ttf's Python dependency
+    ## so that the correct/appropriate Python version is removed.
+    - name: Remnant symlink cleanup
       run: |
+        brew unlink python@3 || true
+        brew uninstall --ignore-dependencies python@3 || true
+        brew unlink python@3.12 || true
+        brew uninstall --ignore-dependencies python@3.12 || true
         for f in $(find /usr/local/bin -type l -print); do \
-           (readlink $f | grep -q -s "/Library") && echo Removing "$f" && rm -f "$f"; \
-         done || exit 0
+          (readlink $f | grep -q -s "/Library") && echo Removing "$f" && rm -f "$f"; \
+        done || exit 0
     - name: Install dependencies
-      run: |
-        sh -ex .travis/deps.sh osx
+      run: sh -ex .travis/deps.sh osx
     - name: cmake-builder.sh
       run: |
         cmake/cmake-builder.sh --config Release --flavor xcode --lto --notest --cpack_suffix x86_64.${{matrix.os}}