Revert custom patch workaround for a Java 8 import handling bug

Java 11 and later have no problem with the original code, so we don't
need this patch anymore.

.gitignore

 /bin/
 /src/org/eventb/internal/core/typecheck/TypeUnifier.java
 .gradle
-SubParsers.patch
 build
 local.*

.gitlab-ci.yml

@@ -9,7 +9,7 @@ cache:
 
 publish:
   stage: deploy
-  image: eclipse-temurin:8
+  image: eclipse-temurin:17
   script:
     - openssl aes-256-cbc -pass "env:ENCRYPTION_PASSWORD" -d -a -md md5 -in gradle.properties.enc -out gradle.properties
     - openssl aes-256-cbc -pass "env:ENCRYPTION_PASSWORD" -d -a -md md5 -in pubring.gpg.enc -out pubring.gpg

README.md

@@ -14,6 +14,3 @@ No original file is changed, but we added:
 * pubring.gpg.enc
 * secring.gpg.enc
 * settings.gradle
-
-Note to future Jens:
-After updating the sources the ```gradle patch``` task must be run. This modifies the sources. **Do not run the task multiple times!**

build.gradle

@@ -49,31 +49,6 @@ public class ASTPlugin {
 	}
 }
 
-task patch() {
-	doLast {
-		def patch_content = """\
-diff --git a/src/org/eventb/internal/core/parser/SubParsers.java b/src/org/eventb/internal/core/parser/SubParsers.java
-index e71bf08..0977da1 100644
---- a/src/org/eventb/internal/core/parser/SubParsers.java
-+++ b/src/org/eventb/internal/core/parser/SubParsers.java
-@@ -492,7 +492,7 @@ public class SubParsers {
-
- 	};
-
--	public static class BoundIdentDeclSubParser extends ValuedNudParser<BoundIdentDecl> {
-+	public static class BoundIdentDeclSubParser extends ValuedNudParser<org.eventb.core.ast.BoundIdentDecl> {
-
- 		@Override
- 		protected int getKind(AbstractGrammar grammar) {
-"""
-
-		File p = file("SubParsers.patch")
-		p.delete()
-		p << patch_content
-		ant.patch(patchfile: 'SubParsers.patch', originalfile: 'src/org/eventb/internal/core/parser/SubParsers.java', failonerror: 'true')
-	}
-}
-
 java {
 	sourceCompatibility = JavaVersion.VERSION_1_7
 

src/org/eventb/internal/core/parser/SubParsers.java

@@ -492,7 +492,7 @@ public class SubParsers {
 
 	};
 
-	public static class BoundIdentDeclSubParser extends ValuedNudParser<org.eventb.core.ast.BoundIdentDecl> {
+	public static class BoundIdentDeclSubParser extends ValuedNudParser<BoundIdentDecl> {
 
 		@Override
 		protected int getKind(AbstractGrammar grammar) {