Fixed various issues with libfcgi on Linux, mainly related to stdout,stderr,stdin, feof and related.

Added `reset' to the libfcgi input stream so that it is possible to reset previous errors.

library/server/libfcgi/implementation/mac/fcgi_imp.e

@@ -32,7 +32,12 @@ feature -- Access
 
 	fcgi_end_of_input: BOOLEAN
 		do
-			Result := fcgi.feof (fcgi.stdin) = 0
+			Result := fcgi.feof (fcgi.stdin) /= 0 --| in fact, True if feof (..) = EOF
+		end
+	
+	fcgi_clearerr
+		do
+			fcgi.clearerr (fcgi.stdin)
 		end
 
 feature -- FCGI Connection