[kernel] Fix FAT filesystem adding blocks when seeking past EOF #2167
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This PR fixes the recently found issue with the FAT filesystem not properly adding file blocks to a file when seeking past EOF and then writing. The 8086 toolchain linker LD86 does this and would not function properly on FAT filesystems.
Discussed in #2159 (comment) and issued opened with #2166.
The 8086 toolchain now runs properly on FAT and MINIX filesystems.