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RNDIS support for CCRX toolchain (endian independed configuration) added #1346

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This PR adds support for RNDIS with the CCRX toolchain. It also adds endian independent support (means it is working in big and in little endian configuration).

Note: This PR needs the modification in the PR #1311 to work without any problems.

Modification
dnsserver.c: Use of the pack macros from the cc.h port file (required for every port of the lwIP)
rndis_report.h: New macros that are be calculated by the preprocessor and are used within compile-time constants only (so that there is no endian overhead at runtime).
rndis_report.c: Added endian independent support and rearrange of the code.
ecm_rndis_device.c: Added endian independent support. Modification to support CCRX toolchain.

The modification was successful tested with the CCRX toolchain in little and big endian mode and also with the GCC toolchain in little endian mode. Tested with lwIP version 2.1.3 and the included httpd web server.

Support for the CCRX toolchain added. Also added independent endian
support.
Tried to declare a byte array as const to move it from RAM memory to ROM
memory. But unfortunately it produces build errors on some platforms.
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