[CM] Errors building latest S7 (today's) on VS2019, Windows 10

[bil at ccrma.Stanford.EDU]

> compiling S7 throws errors for lines 11121 to 11125:
>   Error	C2491	'asinh': definition of dllimport function not allowed

I misunderstood something Rick sent me -- in s7.c at line 11119
enclose the asinh etc in (_MSC_VER < 1700)

#if (_MSC_VER < 1700)
   /* in MS C, we need to provide inverse hyperbolic trig funcs and cbrt 
*/
   static double asinh(double x) {return(log(x + sqrt(1.0 + x * x)));}
   static double acosh(double x) {return(log(x + sqrt(x * x - 1.0)));}
   /* perhaps less prone to numerical troubles (untested): 2.0 * 
log(sqrt(0.5 * (x + 1.0)) + sqrt(0.5 * (x - 1.0))) */
   static double atanh(double x) {return(log((1.0 + x) / (1.0 - x)) / 
2.0);}
   static double cbrt(double x) {if (x >= 0.0) return(pow(x, 1.0 / 3.0)); 
return(-pow(-x, 1.0 / 3.0));}
#endif

I'm guessing about the 1700.