biology/gatk: mark BROKEN

FAILURE: Build failed with an exception.

* Where:
Build file '/wrkdirs/usr/ports/biology/gatk/work/gatk-4.2.6.1/build.gradle' line: 15

* What went wrong:
Plugin [id: 'de.undercouch.download', version: '4.1.2'] was not found in any of the following sources:

- Gradle Core Plugins (plugin is not in 'org.gradle' namespace)
- Plugin Repositories (could not resolve plugin artifact 'de.undercouch.download:de.undercouch.download.gradle.plugin:4.1.2')
  Searched in the following repositories:
    Gradle Central Plugin Repository

Reported by:	pkg-fallout
Approved by:	portmgr blanket

biology/gatk/Makefile

@@ -10,6 +10,7 @@ COMMENT=	Variant discovery in high-throughput sequencing data
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE.TXT
 
+BROKEN=		fails to build: Build failed with an exception
 BROKEN_FreeBSD_12_powerpc64=	fails to build: String index out of range: -1
 
 BUILD_DEPENDS=	gradle:devel/gradle