should work on OS/2 2.1 again.
uses reliable signals when spawing.
do not use popen() any more - no intermediate shell unless needed.
+
+after 5.003_11:
+ Functions emx_{malloc,realloc,calloc,free} are exported from DLL.
+ get_sysinfo() bugs corrected (flags were not used and wrongly defined).
+
+after 5.003_20:
+ _isterm is substituted instead of isatty, s?random instead of srand.
+ `register' disabled if -DDEBUGGING and not AOUT build: stupid SD386.
+ 3-argument select() was stomping over memory.