rtutils: use jl_strtof_c to convert strings to float

indirect conversion (string->double->float) will lose precision

Author: inkydragon

src/rtutils.c

@@ -518,11 +518,7 @@ JL_DLLEXPORT jl_nullable_float32_t jl_try_substrtof(char *str, size_t offset, si
         bstr = newstr;
         pend = bstr+len;
     }
-#if defined(_OS_WINDOWS_) && !defined(_COMPILER_GCC_)
-    float out = (float)jl_strtod_c(bstr, &p);
-#else
     float out = jl_strtof_c(bstr, &p);
-#endif
 
     if (errno==ERANGE && (out==0 || out==HUGE_VALF || out==-HUGE_VALF)) {
         hasvalue = 0;