6717128: Using relative path for ALT_OUTPUTDIR does not work properly
Summary: import the absolute output directory when launching sub make process and avoid including defs.make in rules.make
Reviewed-by: kamg, kvn
cfeea66a3fa8ca3686a7cfa2d0ce8ab0169f168d jdk7-b24
cbc8ad9dd0e085a607427ea35411990982f19a36 jdk7-b25
9410f77cc30c604d1caf7c9fe3a57fa19e1acbe8 jdk7-b26
11b4dc9f2be3523ef989a0db8459eb56b3045c3a jdk7-b27