Turn modified fdlibm into Jerry's own libm

* Rename modified fdlibm to jerry-libm
  * Move third-party/fdlibm to jerry-libm
  * Rename original fdlibm.h to jerry-libm-internal.h
    * And remove it from the public headers.
  * Rename jerry-libm's public header to math.h
    * This also makes jerry-core sources include `<math.h>`. Therefore,
      should anyone want to use a different libm implementation with
      jerry, it becomes possible. (The same way as we provide a minimal
      libc with standard headers, but should it be insufficient or
      conflicting for someone, it can be replaced.)
  * Drop `s_` prefix from jerry-libm sources
    * The original fdlibm implementation had various prefixes (e.g., `k_`
      for sources of kernel routines, and `w_` for wrapper routines), but
      after the specialization of fdlibm to jerry, only `s_` remained.
      Since it does not encode anything anymore, it can be dropped.
  * Stylistic edits to jerry-libm's CMakeLists
    * Align project name with other CMakeLists in the code base
  * Move Jerry-LibM under Apache License
    * Using the same approach as was used by linux-wireless when ath5k
      driver license needed clarification. Solution was proposed by SFLC.
      External mail for future reference: http://lwn.net/Articles/247806/

* Tests & checks
  * Remove FD from the name of libm unit test-related files
  * Make vera++ and cppcheck check jerry-libm

* Targets
  * Speculative update of targets to use jerry-libm

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

tests/unit/test-common.h

@@ -1,4 +1,4 @@
-/* Copyright 2014-2015 Samsung Electronics Co., Ltd.
+/* Copyright 2014-2016 Samsung Electronics Co., Ltd.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,7 +18,7 @@
 
 #include "jrt.h"
 
-#include "fdlibm-math.h"
+#include <math.h>
 #include <setjmp.h>
 #include <stdio.h>
 #include <stdlib.h>

tests/unit/test-libm.c

@@ -15,7 +15,7 @@
  */
 
 /**
- * Unit test for fdlibm
+ * Unit test for jerry-libm
  */
 
 #include "test-common.h"
@@ -77,7 +77,7 @@ main (int __attr_unused___ argc,
       char __attr_unused___ **argv)
 {
 #define INF INFINITY
-#include "test-fdlibm.inc.h"
+#include "test-libm.inc.h"
 
   return passed ? 0 : 1;
 } /* main */

tests/unit/test-libm.inc.h

@@ -1,5 +1,5 @@
 /*
- * Generated by tools/gen-test-fdlibm.sh
+ * Generated by tools/gen-test-libm.sh
  * DO NOT EDIT!!!
  */
 check_double ("acos (0.0)", acos (0.0), 1.57079632679489655800E+00);