Fix ccache compiler aliases being first in PATH

Add ccache symlink directory to start of PATH, this must be after
`typeset -U PATH` because on macOS this reorders the list so ccache's
symlinks will no longer be at the start of PATH rendering it unusable.

zshrc

@@ -117,6 +117,17 @@ typeset -U PATH
 typeset -U MANPATH
 typeset -U INFOPATH
 
+# Add ccache symlink directory to start of PATH, this must be after
+# `typeset -U PATH` because on macOS this reorders the list so ccache's
+# symlinks will no longer be at the start of PATH rendering it unusable.
+if [ `uname` = Darwin ]; then
+  [ -f /usr/local/bin/ccache ] && \
+    PATH=/usr/local/opt/ccache/libexec:$PATH
+else
+  [ -f /usr/bin/ccache ] && \
+    PATH=/usr/lib/ccache:$PATH
+fi
+
 # Aliases
 alias grep='grep --color=always'
 alias cninja='cmake -GNinja -DCMAKE_EXPORT_COMPILE_COMMNADS=ON'