build: Fixes for gcc 5 compilation

These are fixes for compilation under gcc 5.0...

chan_sip.c:    In parse_request needed to make 'lim' unsigned.
inline_api.h:  Needed to add a check for '__GNUC_STDC_INLINE__' to detect C99 
               inline semantics (same as clang).
ccss.c:        In ast_cc_set_parm, needed to fix weird comparison.
dsp.c:         Needed to work around a possible compiler bug.  It was throwing 
               an array-bounds error but neither
               sgriepentrog, rmudgett nor I could figure out why.
manager.c:     In action_atxfer, needed to correct an array allocation.

This patch will go to 11, 13, trunk.

Review: https://reviewboard.asterisk.org/r/4581/
Reported-by: Jeffrey Ollie
Tested-by: George Joseph
ASTERISK-24932 #close
........

Merged revisions 434113 from http://svn.asterisk.org/svn/asterisk/branches/11
........

Merged revisions 434114 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@434115 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/ccss.c

@@ -825,7 +825,7 @@ int ast_cc_set_param(struct ast_cc_config_params *params, const char * const nam
 		return 0;
 	}
 
-	if (!sscanf(value, "%30u", &value_as_uint) == 1) {
+	if (sscanf(value, "%30u", &value_as_uint) != 1) {
 		return -1;
 	}