ST-1.9.2 for SRS.

• Patch st.arm.patch, for ARM.
• Patch st.osx.kqueue.patch, for osx.
• Patch st.disable.examples.patch, for ubuntu.
• Refine TAB of code.
• Merge from michaeltalyansky and xzh3836598, support ARM.
• Merge from toffaletti, support valgrind for ST.
• Patch st.osx10.14.build.patch, for osx 10.14 build.
• Support macro MD_ST_NO_ASM to disable ASM, #8.
• Merge patch srs#1282 to support aarch64, #9.
• Support OSX for Apple Darwin, macOS, #11.
• Refine performance for sleep or epoll_wait(0), #17.
• Support utest by gtest and coverage by gcov/gocvr.
• Only support for Linux and Darwin. #19, srs#2188.