add environment variables to mac builds to avoid ._* files from showing up in archives

JDK 7u5 b05 bundles for macos contains a lot of unusual files (e.g, jdk1.7.0_05/jre/lib/ext/._dnsns.jar):

stt-mac-01:artem gtee$ ls -la jdk1.7.0_05/jre/lib/ext/
total 3120
drwxr-xr-x 16 gtee wheel 544 May 16 07:11 .
drwxr-xr-x 158 gtee wheel 5372 May 16 06:07 ..
-rw-r--r--@ 1 gtee wheel 246 May 16 05:24 ._dnsns.jar
-rw-r--r--@ 1 gtee wheel 246 May 16 06:07 ._localedata.jar
-rw-r--r--@ 1 gtee wheel 246 May 16 05:52 ._meta-index
-rw-r--r--@ 1 gtee wheel 246 May 16 05:24 ._sunec.jar
-rw-r--r--@ 1 gtee wheel 246 May 16 05:34 ._sunjce_provider.jar
-rw-r--r--@ 1 gtee wheel 246 May 16 05:24 ._sunpkcs11.jar
-rw-r--r--@ 1 gtee wheel 246 May 16 05:37 ._zipfs.jar
-rw-r--r--@ 1 gtee wheel 8923 May 16 05:24 dnsns.jar
-rw-r--r--@ 1 gtee wheel 1023477 May 16 06:07 localedata.jar
-rw-r--r--@ 1 gtee wheel 581 May 16 05:52 meta-index
-rw-r--r--@ 1 gtee wheel 15817 May 16 05:24 sunec.jar
-rw-r--r--@ 1 gtee wheel 198110 May 16 05:34 sunjce_provider.jar
-rw-r--r--@ 1 gtee wheel 237969 May 16 05:24 sunpkcs11.jar
-rw-r--r--@ 1 gtee wheel 68643 May 16 05:37 zipfs.jar