ELF i386 loader and libc relocated to default base (0x8048000)

[symflood]

This PR is the part of the solution for an issue angr/cle#65.
both ld-linux.so.2 and libc.so.6 are relocated to 0x8048000
sample usage will be provided as a regression test for CLE

$ readelf -l tests/i386/prelinked/libc.so.6 | grep LOAD
  LOAD           0x000000 0x08048000 0x08048000 0x1b2d30 0x1b2d30 R E 0x1000
  LOAD           0x1b3260 0x081fc260 0x081fc260 0x02c74 0x057bc RW  0x1000
$ readelf -l tests/i386/prelinked/ld-linux.so.2 | grep LOAD
  LOAD           0x000000 0x08048000 0x08048000 0x21ef4 0x21ef4 R E 0x1000
  LOAD           0x022c80 0x0806bc80 0x0806bc80 0x00bd8 0x00c98 RW  0x1000

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