Revert "Use the toolchain from JDK 17"

Revert submission 2164342-use-jdk17

Reason for revert: DroidMonitor-triggered revert due to breakage b/250426490

Reverted Changes:
Ib1a24e7ea:Update path for libjli.so
I3375bd4e4:Use the toolchain from JDK 17
I9183e5511:Use the toolchain from JDK 17

Change-Id: I28fc32290dd337b7d44bb98bc52956ee84f01aaa
diff --git a/java/config/config.go b/java/config/config.go
index a84c315..ea44aaa 100644
--- a/java/config/config.go
+++ b/java/config/config.go
@@ -132,7 +132,12 @@
 		if override := ctx.Config().Getenv("OVERRIDE_JLINK_VERSION_NUMBER"); override != "" {
 			return override
 		}
-		return "17"
+		switch ctx.Config().Getenv("EXPERIMENTAL_USE_OPENJDK17_TOOLCHAIN") {
+		case "true":
+			return "17"
+		default:
+			return "11"
+		}
 	})
 
 	pctx.SourcePathVariable("JavaToolchain", "${JavaHome}/bin")
diff --git a/ui/build/config.go b/ui/build/config.go
index 15eea2d..14a99d0 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -387,13 +387,13 @@
 		if override, ok := ret.environ.Get("OVERRIDE_ANDROID_JAVA_HOME"); ok {
 			return override
 		}
+		if ret.environ.IsEnvTrue("EXPERIMENTAL_USE_OPENJDK17_TOOLCHAIN") {
+			return java17Home
+		}
 		if toolchain11, ok := ret.environ.Get("EXPERIMENTAL_USE_OPENJDK11_TOOLCHAIN"); ok && toolchain11 != "true" {
 			ctx.Fatalln("The environment variable EXPERIMENTAL_USE_OPENJDK11_TOOLCHAIN is no longer supported. An OpenJDK 11 toolchain is now the global default.")
 		}
-		if toolchain17, ok := ret.environ.Get("EXPERIMENTAL_USE_OPENJDK17_TOOLCHAIN"); ok && toolchain17 != "true" {
-			ctx.Fatalln("The environment variable EXPERIMENTAL_USE_OPENJDK17_TOOLCHAIN is no longer supported. An OpenJDK 17 toolchain is now the global default.")
-		}
-		return java17Home
+		return java11Home
 	}()
 	absJavaHome := absPath(ctx, javaHome)