CI: Remove workaround (`dmd` in PATH, a symlink to ldmd2) #269

Job	Run time
Default release build / Build documentation for all repos	3m 6s
Default release build / Build release for linux on ubuntu-20.04	8m 49s
Default release build / Build release for osx on macos-12	4m 59s
Default release build / Build release for windows on windows-2019	11m 42s
Default release build / Build release for freebsd on ubuntu-latest	5m 27s
Validate outputs of build_release_template.yml	1s
Validate results of build_release_template.yml (windows-latest, windows, dmd.master.windows.7z)	27s
Validate results of build_release_template.yml (macos-latest, osx, dmd.master.osx.tar.xz)	1m 40s
Validate results of build_release_template.yml (ubuntu-latest, linux, dmd.master.linux.tar.xz)	14s
Validate results of build_release_template.yml (ubuntu-latest, freebsd, dmd.master.freebsd-64.tar...	42s
	37m 7s

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