[tnozaki-zlib] upgrade zlib 1.2.3 to 1.2.11 and git subtree'ize

[Takehiko NOZAKI]

T/O

[Takehiko NOZAKI]

• Issue #224 TNF local patch - include unistd.h for some syscall
• Issue #225 TNF local patch - savecore build failure caused by funopen(3) + gzclose incompatibility
• Issue #226 TNF local patch - use libkern.h instead of C standard header for libsa/libkern
• Issue #227 TNF local patch - conflict crc32() prototype between zlib.h and libkern.h
• Issue #228 TNF local patch - disable NULL check for some arch kernel mapped as 0x0 address by bootloader
• Issue #229 TNF local patch - make crc32 table smaller for libsa
• Issue #230 TNF local patch - don't use ptrdiff_t directly
• Issue #231 TNF local patch - cast away const qual by __UNCONST macro
• Issue #232 TNF local patch - rename variable name min/max -> mmin/mmax shadowed by libkern.h
• Issue #233 TNF local patch - use size_t/ssize_t for write(2) instead of int/unsigned
• Issue #234 TNF local patch - suppress warning implicit declaration of close(2) for libkern.h
• Issue #235 TNF local patch - assertion for NULL dereference

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[Takehiko NOZAKI]

tnozaki-zlib branch merged <<cset:e5a7f37efe9f6686108f45fd888b595df3ca7844>>