merge 2.0

@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // current release version
 #define VERSION_MAJOR       3
 #define VERSION_MINOR       0
-#define VERSION_REVISION    211
+#define VERSION_REVISION    212
 
 // generated by configure, only macros.
 #include <srs_auto_headers.hpp>
@@ -136,8 +136,5 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #if !defined(__amd64__) && !defined(__x86_64__) && !defined(__i386__) && !defined(__arm__)
     #error "only support i386/amd64/x86_64/arm cpu"
 #endif
-#if defined(__arm__) && (__GLIBC__ != 2 || __GLIBC_MINOR__ > 15)
-    #error "for arm, only support glibc <= 2.15"
-#endif
 
 #endif