Use Doug Lea's malloc as an alternative to YAP's standard malloc

don't use TR directly in scanner/parser, this avoids trouble with ^C while
consulting large files.
pass gcc -mno-cygwin to library compilation in cygwin environment (cygwin should
compile out of the box now).


git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1168 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

C/heapgc.c

@@ -94,7 +94,7 @@ static cont *cont_top0;
 #endif
 static cont *cont_top;
 
-static int
+static void
 gc_growtrail(int committed)
 {
 #if USE_SYSTEM_MALLOC
@@ -112,6 +112,7 @@ gc_growtrail(int committed)
 #endif
   longjmp(Yap_gc_restore, 1);
 #endif
+  
 }
 
 inline static void