Release v0.3.11

new features:

• __builtin_inf/__builtin_nan
• support ./src/string/*.c
• support ./src/ctype/*.c
• support ./src/prng/*.c
• support ./src/math/*.c
• support ./src/stdio/*.c
• public ctype.h, string.h
• public stdlib.h
• public stdio.h
• public math.h

changes:

• c2go: support local type
• fix: unpublic static name
• mod: c2go 0.7.9

libc/test features:

• mod: github.com/goplus/libc/test/common
• autopub mtest.h, test.h
• test/c2go.cfg: use template cmds
• test mod: github.com/goplus/libc/test/cmd/test/random
• test mod: github.com/goplus/libc/test/cmd/test/strtod