A few more checks for ac converter tool.

tools/ac_converter.py

@@ -162,6 +162,11 @@ function_data = \
      'HAVE_GETPWUID_R': ('getpwuid_r', 'pwd.h'),
      'HAVE_GETUID': ('getuid', 'unistd.h'),
      'HAVE_LRINTF': ('lrintf', 'math.h'),
+     'HAVE_DECL_ISNAN': ('isnan', 'math.h'),
+     'HAVE_DECL_ISINF': ('isinf', 'math.h'),
+     'HAVE_ROUND': ('round', 'math.h'),
+     'HAVE_NEARBYINT': ('nearbyint', 'math.h'),
+     'HAVE_RINT': ('rint', 'math.h'),
      'HAVE_MKFIFO': ('mkfifo', 'sys/stat.h'),
      'HAVE_MLOCK': ('mlock', 'sys/mman.h'),
      'HAVE_NANOSLEEP': ('nanosleep', 'time.h'),