RFR: 8140723: Remove source code conditionalized on JAVASE_EMBEDDED

[David Holmes]

The bug report for this is confidential but quite simply all of the 
little tweaks and knobs we added to the open build and source files to 
support the Java SE Embedded product no longer need to be there for JDK 
9. Many of them have already been removed via other changes but this 
cleans up the rest.

webrev: http://cr.openjdk.java.net/~dholmes/8140723/webrev.jdk/

The changes relate to:
- Java version information
- isEmbedded() check in test code Platform.java
- special AWT build settings for Embedded
- special Toolkit handling for Embedded

In make/lib/Awt2dLibraries.gmk I commented out a setting which was 
seemingly introduced only to support (old) embedded releases:

# decimal constant is unsigned only in ISO C90 (JAVASE_EMBEDDED)
BUILD_LIBAWT_XAWT_XToolkit.c_CFLAGS := -w

which I think pertained to:

#define DEF_AWT_MAX_POLL_TIMEOUT ((uint32_t)4000000000)

Unless AWT folk indicate otherwise I will delete those two lines in 
final push.

Thanks,
David
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