增加对mmap、munmap、mprotect的支持 (#15)

Merge branch 'globalsyms' into 'master'

Fix global symbols relocations

See merge request redox-os/relibc!325

Fix global symbols relocations

Instead of a single source of symbols, now linker keeps a list of DSO (former Library) objects
with their own symbols map. That helps to process R_X86_64_COPY relocati

Fix global symbols relocations

Instead of a single source of symbols, now linker keeps a list of DSO (former Library) objects
with their own symbols map. That helps to process R_X86_64_COPY relocations correctly.
For example, if 'a.out' executable with dependencies ['libstdc++.so', 'libc.so'] is being loaded
and 'a.out' uses 'stdout' symbol from 'libc.so', its relocation process goes as follows:
- linker processes relocation entry 'stdout' of type R_X86_64_GLOB_DAT from 'libc.so',
- it goes through object list ['a.out', 'libstdc++.so', 'libc.so'] to find first object
that exports 'stdout' symbol. The symbol is in 'a.out' with the value e.g. '0x404070',
- linker sets 'stdout' symbol GOT entry in 'libc.so' to '0x404070',
....
- linker processes relocation entry 'stdout' of type R_X86_64_COPY from 'a.out',
- it goes through object list excluding 'a.out': ['libstdc++.so', 'libc.so']. The symbol is found in 'libc.so',
- linker copies the 'stdout' symbol content from 'libc.so' to memory at address '0x404070' (in 'a.out' object).

Objects are relocated in reverse order they were loaded. So in the example above, linker starts with relocating
'libc.so' and ends with 'a.out'. It is necessary e.g. when linking with 'libstdc++.so' - there are many
relocations which symbols are found in 'libstdc++.so', so they need to be resolved before their contents are
copied to 'a.out'. That also matches GNU ld.so behavior.

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Merge branch 'lD_PATH' into 'master'

L d path

See merge request redox-os/relibc!300

Modify ld_script so that it works on linux.

Honestly, I have no idea why are these modifications needed, but it
seams they are needed

Merge branch 'new-toolchain' into 'master'

Support use of new cross compiler

See merge request redox-os/relibc!203

Support use of new cross compiler

Fix makefile for tests, add sysroot target

Ignore *all* target directories

Merged master into master

Merge branch 'master' into master

Merge pull request #92 from tdbgamer/feature/strtok

Implement strtok

* create basic strtok
* add test and expected output

Implement some functions on Linux

merge with origin, put unistd back the way it was

Add overarching staticlib