community/openjdk7: build failure on x86_64

openjdk7 fails to build on x86_64:

checking for xsltproc... /usr/bin/xsltproc
checking if the VM and compiler work together... configure: error: Compiler failed to compile Java code.
>>> ERROR: openjdk7: build failed

See: https://build.alpinelinux.org/buildlogs/build-edge-x86_64/community/openjdk7/openjdk7-7.301.2.6.26-r0.log

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