Don't rely anymore on locale-dependent wording in Pacman output (#65878)

Use line position instead, as specified in upstream pacman source code.

See: https://git.archlinux.org/pacman.git/tree/src/pacman/package.c#n260
Fixes: https://github.com/ansible/ansible/issues/64682
Fixes: https://github.com/ansible/ansible/issues/65237

lib/ansible/modules/packaging/os/pacman.py

@@ -158,22 +158,38 @@ import re
 from ansible.module_utils.basic import AnsibleModule
 
 
-def get_version(pacman_output):
+def get_version(pacman_output, from_sync=False):
     """Take pacman -Qi or pacman -Si output and get the Version"""
     lines = pacman_output.split('\n')
-    for line in lines:
-        if line.startswith('Version '):
-            return line.split(':')[1].strip()
-    return None
+    # Version information is always printed out on the 2nd line of a
+    # query output (-Q/--query) and on the 3rd line of a sync output
+    # (-S/--sync). Obviously lines index begin at 0.
+    # See: https://git.archlinux.org/pacman.git/tree/src/pacman/package.c#n260
+    index = 1
+    if from_sync:
+        index = 2
+    try:
+        version = lines[index].split(':')[1].strip()
+    except IndexError:
+        version = None
+    return version
 
 
-def get_name(module, pacman_output):
+def get_name(module, pacman_output, from_sync=False):
     """Take pacman -Qi or pacman -Si output and get the package name"""
     lines = pacman_output.split('\n')
-    for line in lines:
-        if line.startswith('Name '):
-            return line.split(':')[1].strip()
-    module.fail_json(msg="get_name: fail to retrieve package name from pacman output")
+    # Package name is always printed out on the 1st line of a
+    # query output (-Q/--query) and on the 2nd line of a sync output
+    # (-S/--sync). Obviously lines index begin at 0.
+    # See: https://git.archlinux.org/pacman.git/tree/src/pacman/package.c#n260
+    index = 0
+    if from_sync:
+        index = 1
+    try:
+        name = lines[index].split(':')[1].strip()
+    except IndexError:
+        module.fail_json(msg="get_name: fail to retrieve package name from pacman output")
+    return name
 
 
 def query_package(module, pacman_path, name, state="present"):
@@ -190,6 +206,10 @@ def query_package(module, pacman_path, name, state="present"):
             # a non-zero exit code doesn't always mean the package is installed
             # for example, if the package name queried is "provided" by another package
             installed_name = get_name(module, lstdout)
+            # If something goes weird and the first line of the output
+            # does not contain a name, but an error message for exemple,
+            # it's not that serious, because the following test will
+            # exit us sooner.
             if installed_name != name:
                 return False, False, False
 
@@ -199,7 +219,7 @@ def query_package(module, pacman_path, name, state="present"):
         rcmd = "%s --sync --info %s" % (pacman_path, name)
         rrc, rstdout, rstderr = module.run_command(rcmd, check_rc=False)
         # get the version in the repository
-        rversion = get_version(rstdout)
+        rversion = get_version(rstdout, True)
 
         if rrc == 0:
             # Return True to indicate that the package is installed locally, and the result of the version number comparison