JDK-6699172 : 6613871 breaks ALT_COMPILER_PATH in 6u10
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6613871 breaks the setting of ALT_COMPILER_PATH.
See 6547520 for a related problem.
Yes, the Makefiles are a "twisted maze of paths" but the change in 6613871 is done before COMPILER_PATH is set from ALT_COMPILER_PATH.
6699172 breaks ALT_COMPILER_PATH in 6u10 [ Kenneth Russel, Joseph Kowalski, Kelly O'Hair ]
Using ALT_COMPILER_CC, ALT_COMPILER_CXX and ALT_COMPILER_CPP,
instead of the system default environment variables CC, CXX and CPP
so it does not break ALT_COMPILER_PATH.
This is necessary, since those default env vars may be set
on some systems, but shall not be used regarding our JDK6 build infrastructure.