Make the memory allocation generic

 But what about memory allocation?  Remember, we MUST allocate memory
 from Clipper's Extend System function if we are being used as a
 Clipper UDF.  But we can't call _xalloc() if we are compiled as a
 stand alone program.  The way I handle this is to #define memory
 management pseudo-functions that will conditionally preprocess to
 either the Extend System functions, or to the C library function,
 depending on whether IS_CLIPPER has been defined.

 Example 4 is a template example of using this technique.

 Figure 1 - MSC 6.0 Intrinsic Function List

 The following functions can be compiled into the intrinsic form:

 abs
 _disable
 _enable
 fabs
 inp
 inpw
 _lrotl

 _lrotr
 labs
 memcmp
 memcpy
 memset
 outp
 outpw

 _rotl
 _rotr
 strcat
 strcmp
 strcpy
 strlen
 strset