logger: Bring back ability to turn debug on by source file

Somewhere along the way we lost the ability to debug individual
source files.  For modules, this wasn't a big deal but all the
source files in ./main are in the one "core" module so debugging
individual core capabilities was almost impossible.

* Added a test to DEBUG_ATLEAST that also checks __FILE__ instead
of just module name.  Any source file will work even if it's in
a module subdirectory.

Change-Id: Icc0af41837f3b1679dec7af21fa32cd1f7469f6e

include/asterisk/logger.h

@@ -429,7 +429,9 @@ void ast_callid_strnprint(char *buffer, size_t buffer_size, ast_callid callid);
 
 #define DEBUG_ATLEAST(level) \
 	(option_debug >= (level) \
-		|| (ast_opt_dbg_module && (int)ast_debug_get_by_module(AST_MODULE) >= (level)))
+		|| (ast_opt_dbg_module \
+        	&& ((int)ast_debug_get_by_module(AST_MODULE) >= (level) \
+				|| (int)ast_debug_get_by_module(__FILE__) >= (level))))
 
 /*!
  * \brief Log a DEBUG message