Run roundtrip on make check

Adding check-no-roundtrip is done by @masatake.
NOTE: We cannot find the way to ru roundtrip on msys2.
See msys2/MSYS2-packages#84 .

makefiles/testing.mak

@@ -1,7 +1,8 @@
 # -*- makefile -*-
 .PHONY: check units fuzz noise tmain tinst clean-units clean-tmain clean-gcov run-gcov codecheck cppcheck dicts cspell
 
-check: tmain units
+chekc-no-roundtrip: tmain units
+check: tmain units roundtrip
 
 clean-local: clean-units clean-tmain
 
@@ -159,10 +160,16 @@ tinst:
 #
 # Test readtags
 #
+if USE_READCMD
 roundtrip: $(READ_TEST)
 	$(V_RUN) \
 	builddir=$$(pwd); \
 	$(SHELL) $(srcdir)/misc/roundtrip $(READ_TEST) $${builddir}/Units
+else
+# apparently Automake doesn't like adding an extra dependency in a conditional,
+# so add it unconditionally and simply have it not do anything if it's disabled.
+roundtrip:
+endif
 
 #
 # Checking code in ctags own rules

win32/appveyor.bat

@@ -115,7 +115,7 @@ c:\cygwin64\bin\file readtags.exe
 .\ctags --version || exit 1
 
 :: Run tests on msys2
-bash -lc "make check APPVEYOR=1"
+bash -lc "make check-no-roundtrip APPVEYOR=1"
 
 @echo off
 goto :eof
@@ -171,7 +171,7 @@ if "%normalbuild%-%ARCH%"=="yes-x64" (
   @echo Tests for msys2 x64 are skipped.
   exit 0
 )
-bash -lc "make check APPVEYOR=1"
+bash -lc "make check-no-roundtrip APPVEYOR=1"
 
 @echo off
 goto :eof