Makefile cleanup for cross compiling ease #35
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In order to utilize the normal variable name for prefixing the cross-compiler's binary prefix for the target tools.
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In general, for cross compiling, the
CROSS_COMPILEvariable name is used rather thanCROSS_PREFIX. Additionally, to ease integration with tools like OpenEmbedded's bitbake or other distro building systems, allow for each of the compiler names to be overridden easily by the environment rather than needing to edit the Makefile.