Add a generic scalb implementation

This is a preparatory patch to enable building a _Float128
variant to ease reuse when building a _Float128 variant to
alias this long double only symbol.

Notably, stubs are added where missing to the native _Float128
sysdep dir to prevent building these newly templated variants
created inside the build directories.

Also noteworthy are the changes around LIBM_SVID_COMPAT.  These
changes are not intuitive.  The templated version is only
enabled when !LIBM_SVID_COMPAT, and the compat version is
predicated entirely on LIBM_SVID_COMPAT.  Thus, exactly one is
stubbed out entirely when building.  The nldbl scalb compat
files are updated to account for this.

Likewise, fixup the reuse of m68k's e_scalb{f,l}.c to include
it's override of e_scalb.c.  Otherwise, the search path finds
the templated copy in the build directory.  This could be
futher simplified by providing an overridden template, but I
lack the hardware to verify.

math/w_scalb_compat.c

@@ -41,18 +41,15 @@ sysv_scalb (double x, double fn)
 
   return z;
 }
-#endif
 
 
 /* Wrapper scalb */
 double
 __scalb (double x, double fn)
 {
-#if LIBM_SVID_COMPAT
   if (__glibc_unlikely (_LIB_VERSION == _SVID_))
     return sysv_scalb (x, fn);
   else
-#endif
     {
       double z = __ieee754_scalb (x, fn);
 
@@ -79,7 +76,8 @@ __scalb (double x, double fn)
     }
 }
 weak_alias (__scalb, scalb)
-#ifdef NO_LONG_DOUBLE
+# ifdef NO_LONG_DOUBLE
 strong_alias (__scalb, __scalbl)
 weak_alias (__scalb, scalbl)
+# endif
 #endif