fix: update build on windows; update path in ci

curl/build.vsh

@@ -148,7 +148,21 @@ mut cmd := cli.Command{
 		// TODO: build in temp then remove old and move new from temp.
 		rmdir_all(dst_dir) or {} // Remove old library files.
 		silent := cmd.flags.get_bool('silent')!
-		$if windows { setup_windows(silent)! } $else { setup(silent)! }
+		$if windows {
+			setup_windows(silent)!
+			defer {
+				println('\nOn Windows, libcurl requires access to a compatible curl.exe.')
+				println('A reliable way is to use the curl.exe that is shipped with every libcurl version.')
+				println("Add '${curl_mod_dir.replace('/', os.path_separator)}\\libcurl\\bin' to your PATH to make it accessible.")
+				if getenv('CI') != '' {
+					// For now, don't automatically update PATH outside of CI, as it's
+					// easily corrupted and might cause annoyances on a users machine.
+					system('setx PATH "%PATH%;C:\\${vmodules_dir()}\\vibe\\curl\\libcurl\\bin"')
+				}
+			}
+		} $else {
+			setup(silent)!
+		}
 		println('\rFinished!')
 	}
 }

curl/lib.v

@@ -9,10 +9,14 @@ import instructions
 import state
 
 #flag -I@VMODROOT/curl/libcurl/include
-#flag -L@VMODROOT/curl/libcurl
-#flag windows @VMODROOT/curl/libcurl/libcurl.dll
 #include "curl/curl.h"
 
+#flag windows @VMODROOT/curl/libcurl/bin/libcurl-x64.dll
+$if !windows {
+	#flag -L@VMODROOT/curl/libcurl
+	#flag -lcurl
+}
+
 pub type Handle = C.CURL
 
 pub type LinkedList = C.curl_slist