Better meson error on windows when libraries versions are not correct (#3178)

* try except

* proper meson error when problem of version

Author: bilhox

meson.build

@@ -194,8 +194,18 @@ if plat == 'win' and host_machine.cpu_family().startswith('x86')
         check: true,
     )
 
+    foreach lib : dlls
+        if not fs.exists(lib)
+            error(f'''
+            File "@lib@" does not exist.
+            Please try to delete "prebuilt_downloads/", "prebuilt-x64/" and "prebuilt-x86/" directories, and retry the installation.
+            ''')
+        endif
+    endforeach
+
     # put dlls in root of install
     install_data(dlls, install_dir: pg_dir, install_tag: 'pg-tag')
+
 else
     bases = ['/usr/local', '/usr', '/opt/homebrew', '/opt/local']
     foreach inc_dir : bases