Do not use 'echo' as it is not available on plain cmd.exe

test cases/failing/115 run_target in test/meson.build

@@ -1,4 +1,7 @@
 project('trivial test', 'c')
+
+py_inst = import('python').find_installation()
+
 exe = executable('trivialprog', 'trivial.c')
-runt = run_target('invalid', command: ['echo', 'run_target'])
+runt = run_target('invalid', command: [py_inst, '--version'])
 test('runtest', exe, args: runt)

test cases/failing/115 run_target in test/test.json

@@ -1,7 +1,7 @@
 {
     "stdout": [
         {
-            "line": "test cases/failing/115 run_target in test/meson.build:4:0: ERROR: test keyword argument 'args' was of type array[RunTarget] but should have been array[str | File | BuildTarget | CustomTarget | CustomTargetIndex]"
+            "line": "test cases/failing/115 run_target in test/meson.build:7:0: ERROR: test keyword argument 'args' was of type array[RunTarget] but should have been array[str | File | BuildTarget | CustomTarget | CustomTargetIndex]"
         }
     ]
 }

test cases/failing/116 run_target in add_install_script/meson.build

@@ -1,4 +1,7 @@
 project('trivial test', 'c')
+
+py_inst = import('python').find_installation()
+
 exe = executable('trivialprog', 'trivial.c')
-runt = run_target('invalid', command: ['echo', 'run_target'])
+runt = run_target('invalid', command: [py_inst, '--version'])
 meson.add_install_script(exe, runt)

test cases/failing/116 run_target in add_install_script/test.json

@@ -1,7 +1,7 @@
 {
     "stdout": [
         {
-            "line": "test cases/failing/116 run_target in add_install_script/meson.build:4:6: ERROR: meson.add_install_script argument 2 was of type \"RunTarget\" but should have been one of: \"str\", \"File\", \"BuildTarget\", \"CustomTarget\", \"CustomTargetIndex\", \"ExternalProgram\""
+            "line": "test cases/failing/116 run_target in add_install_script/meson.build:7:6: ERROR: meson.add_install_script argument 2 was of type \"RunTarget\" but should have been one of: \"str\", \"File\", \"BuildTarget\", \"CustomTarget\", \"CustomTargetIndex\", \"ExternalProgram\""
         }
     ]
 }