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.

.travis/deps.sh

@@ -2,11 +2,8 @@
 
 install_osx() {
     brew update
-    brew install pkg-config
-    brew install pcre libpng libedit
-    brew install sdl2 freetype2 sdl2_ttf
-    brew install vde
-    brew install cmake gnu-getopt coreutils
+    brew install pkg-config pcre libpng libedit sdl2 freetype2 sdl2_ttf \
+        vde cmake gnu-getopt coreutils
 }
 
 install_linux() {