7132779: build-infra merge: Enable ccache to work for most developer builds. Summary: When a build number is not specified, the JRE_RELEASE_VERSION define contains a date and timestamp. Thus ccache cannot cache the object files for longer than a minute since the define is passed to the compilation of all source files. This change passes JRE_RELEASE_VERSION only to vm_version.cpp and adds a function jre_release_version() to Abstract_VM_Version. This allows all other source files to be ccached. Reviewed-by: ohair, rottenha Contributed-by: fredrik.ohrstrom@oracle.com

os_family = solaris+
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arch = x86+
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arch_model = x86_32+
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os_arch = solaris_x86+
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os_arch_model = solaris_x86_32+
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lib_arch = i386+
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compiler = gcc+
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sysdefs = -DSOLARIS -D_GNU_SOURCE -DIA32+
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