Makefile : library correctly compiled with -O3 switch (issue 114)
Makefile : library compilation compatible with clang
Makefile : library is versioned and linked (issue 119)
lz4.h : no more static inline prototypes (issue 116)
man : improved header/footer (issue 111)
Makefile : Use system default $(CC) & $(MAKE) variables (issue 112)
xxhash : updated to r34

git-svn-id: http://lz4.googlecode.com/svn/trunk@114 650e7d94-2a16-8b24-b05c-7c0b3f6821cd