Add vera rules to check consecutive and trailing empty lines (#3540)

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai@inf.u-szeged.hu

jerry-libm/jerry-libm-internal.h

@@ -30,7 +30,6 @@
 /* Sometimes it's necessary to define __LITTLE_ENDIAN explicitly
    but these catch some common cases. */
 
-
 #ifndef __LITTLE_ENDIAN
 /* Check if compiler has byte order macro. Some older versions do not.
  * If byte order is supported and set to little or target is among common

jerry-libm/sqrt.c

@@ -275,7 +275,6 @@ A.  sqrt(x) by Newton Iteration
            ------------------------------------------------------
               msb    lsb  msb                                 lsb ...order
 
-
              ------------------------        ------------------------
         x0:  |s|   e    |    f1     |    x1: |          f2           |
              ------------------------        ------------------------
@@ -307,7 +306,6 @@ A.  sqrt(x) by Newton Iteration
                 y := (y+x/y)/2          ... almost 35 sig. bits
                 y := y-(y-x/y)/2        ... within 1 ulp
 
-
         Remark 1.
             Another way to improve y to within 1 ulp is:
 
@@ -320,7 +318,6 @@ A.  sqrt(x) by Newton Iteration
                                2
                              3y  + x
 
-
         This formula has one division fewer than the one above; however,
         it requires more multiplications and additions. Also x must be
         scaled in advance to avoid spurious overflow in evaluating the
@@ -367,7 +364,6 @@ A.  sqrt(x) by Newton Iteration
         Square root of +inf, +-0, or NaN is itself;
         Square root of a negative number is NaN with invalid signal.
 
-
 B.  sqrt(x) by Reciproot Iteration
 
    (1)  Initial approximation