(conan-io#14544) M4 Conan 2.0 compatibility

* M4 Conan 2.0 compatibility

* Restore v1 support for M4 env. var.

* Set env_info.PATH in Conan 2 compatible manner

* Removed cond. logic for self.output.PATH.append (see conan-io/conan#12673)

* Added workaround for Conan issue conan-io#12685

* Tweaked how win_bash is set

* Removed workaround for Conan issue conan-io#12685 (fixed in beta8)

* Fixed lint issue

* Conan 2.0 renamed output in self.run()

* Bumped required_conan_version to clear "failed" label

* Removed optional bootstrap support per CCI decision

* Removed import for chdir

* Removed handling of COPYING as symlink (which it is in Git repo)

recipes/m4/all/conanfile.py

@@ -6,8 +6,9 @@
 from conan.tools.microsoft import is_msvc, unix_path
 from conan.tools.scm import Version
 import os
+import shutil
 
-required_conan_version = ">=1.52.0"
+required_conan_version = ">=1.55.0"
 
 
 class M4Conan(ConanFile):
@@ -35,9 +36,9 @@ def package_id(self):
 
     def build_requirements(self):
         if self._settings_build.os == "Windows":
-            if not self.conf.get("tools.microsoft.bash:path", default=False, check_type=bool):
-                self.tool_requires("msys2/cci.latest")
             self.win_bash = True
+            if not self.conf.get("tools.microsoft.bash:path", check_type=str):
+                self.tool_requires("msys2/cci.latest")
 
     def source(self):
         get(self, **self.conan_data["sources"][self.version],
@@ -88,11 +89,12 @@ def generate(self):
 
     def _patch_sources(self):
         apply_conandata_patches(self)
-        # dummy file for configure
-        help2man = os.path.join(self.source_folder, "help2man")
-        save(self, help2man, "#!/usr/bin/env bash\n:")
-        if os.name == "posix":
-            os.chmod(help2man, os.stat(help2man).st_mode | 0o111)
+        if shutil.which("help2man") == None:
+            # dummy file for configure
+            help2man = os.path.join(self.source_folder, "help2man")
+            save(self, help2man, "#!/usr/bin/env bash\n:")
+            if os.name == "posix":
+                os.chmod(help2man, os.stat(help2man).st_mode | 0o111)
 
     def build(self):
         self._patch_sources()
@@ -103,8 +105,7 @@ def build(self):
     def package(self):
         copy(self, "COPYING", src=self.source_folder, dst=os.path.join(self.package_folder, "licenses"))
         autotools = Autotools(self)
-        # TODO: replace by autotools.install() once https://github.com/conan-io/conan/issues/12153 fixed
-        autotools.install(args=[f"DESTDIR={unix_path(self, self.package_folder)}"])
+        autotools.install()
         rmdir(self, os.path.join(self.package_folder, "share"))
 
     def package_info(self):