Whitespace cleanup in root and 'build' folder.

* Removed trailing whitespace and empty lines at top of files.

Condensed build_zip_archive & build_zip_archive into a single script,
build_archive. Updated ImageRules accordingly. Tested on the following:
* jam -q -sTARGET_BOOT_PLATFORM=pxe_ia32 pxehaiku-loade

Condensed build_zip_archive & build_zip_archive into a single script,
build_archive. Updated ImageRules accordingly. Tested on the following:
* jam -q -sTARGET_BOOT_PLATFORM=pxe_ia32 pxehaiku-loader haiku-netboot-archive
* jam -q haiku-boot-floppy
* jam -q haiku-alternative-gcc-archive


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36005 a95241bf-73f2-0310-859d-f6bbb57e9c96

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