dist: add tests/errorcodes.pl to the tarball

Used by test 1477

Reported-by: Xi Ruoyao
Follow-up to 0ca3a4e
Fixes #12462

tests/Makefile.am

@@ -26,15 +26,17 @@ HTMLPAGES = testcurl.html runtests.html
 PDFPAGES = testcurl.pdf runtests.pdf
 MANDISTPAGES = runtests.1.dist testcurl.1.dist
 
-EXTRA_DIST = appveyor.pm azure.pm badsymbols.pl check-deprecated.pl CMakeLists.txt \
- devtest.pl dictserver.py directories.pm disable-scan.pl error-codes.pl extern-scan.pl FILEFORMAT.md \
- processhelp.pm ftpserver.pl getpart.pm globalconfig.pm http-server.pl http2-server.pl \
- http3-server.pl manpage-scan.pl manpage-syntax.pl markdown-uppercase.pl mem-include-scan.pl \
- memanalyze.pl negtelnetserver.py nroff-scan.pl option-check.pl options-scan.pl \
- pathhelp.pm README.md rtspserver.pl runner.pm runtests.1 runtests.pl secureserver.pl \
- serverhelp.pm servers.pm smbserver.py sshhelp.pm sshserver.pl stunnel.pem symbol-scan.pl \
- testcurl.1 testcurl.pl testutil.pm tftpserver.pl util.py valgrind.pm \
- valgrind.supp version-scan.pl check-translatable-options.pl
+EXTRA_DIST = appveyor.pm azure.pm badsymbols.pl check-deprecated.pl           \
+ CMakeLists.txt devtest.pl dictserver.py directories.pm disable-scan.pl       \
+ error-codes.pl extern-scan.pl FILEFORMAT.md processhelp.pm ftpserver.pl      \
+ getpart.pm globalconfig.pm http-server.pl http2-server.pl http3-server.pl    \
+ manpage-scan.pl manpage-syntax.pl markdown-uppercase.pl mem-include-scan.pl  \
+ memanalyze.pl negtelnetserver.py nroff-scan.pl option-check.pl               \
+ options-scan.pl pathhelp.pm README.md rtspserver.pl runner.pm runtests.1     \
+ runtests.pl secureserver.pl serverhelp.pm servers.pm smbserver.py sshhelp.pm \
+ sshserver.pl stunnel.pem symbol-scan.pl testcurl.1 testcurl.pl testutil.pm   \
+ tftpserver.pl util.py valgrind.pm valgrind.supp version-scan.pl              \
+ check-translatable-options.pl errorcodes.pl
 
 DISTCLEANFILES = configurehelp.pm