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/windows/fcgi_c_api.e

@@ -65,12 +65,30 @@ feature {FCGI_IMP} -- Internal
 
 	feof (v: POINTER): INTEGER
 			-- FCGI_feof()
+			-- 0 means EOF not detected.
 		external
 			"dll libfcgi.dll signature (EIF_POINTER): EIF_INTEGER use fcgi_stdio.h "
 		alias
 			"FCGI_feof"
 		end
 
+	ferror (v: POINTER): INTEGER
+			-- FCGI_ferror()
+			-- 0 means no error.
+		external
+			"dll libfcgi.dll signature (EIF_POINTER): EIF_INTEGER use fcgi_stdio.h "
+		alias
+			"FCGI_ferror"
+		end
+
+	clearerr (v: POINTER)
+			-- FCGI_clearerr().
+		external
+			"dll libfcgi.dll signature (EIF_POINTER) use fcgi_stdio.h "
+		alias
+			"FCGI_clearerr"
+		end
+
 feature {NONE} -- Input
 
 	fread (v: POINTER; a_size: INTEGER; n: INTEGER; fp: POINTER): INTEGER
@@ -123,29 +141,28 @@ feature {NONE} -- Output
 feature -- Access
 
 	stdout: POINTER
-			-- FCGI_stdout() return pointer on output FCGI_FILE
+			-- FCGI_stdout return pointer on output FCGI_FILE
 		external
 			"C inline use %"fcgi_stdio.h%""
 		alias
-			"FCGI_stdout"
+			"return FCGI_stdout;"
 		end
 
 	stdin: POINTER
-			-- FCGI_stdin() return pointer on input FCGI_FILE
+			-- FCGI_stdin return pointer on input FCGI_FILE
 		external
 			"C inline use %"fcgi_stdio.h%""
 		alias
-			"FCGI_stdin"
+			"return FCGI_stdin;"
 		end
 
 	stderr: POINTER
-			-- FCGI_stderr() return pointer on error FCGI_FILE
+			-- FCGI_stderr return pointer on error FCGI_FILE
 		external
 			"C inline use %"fcgi_stdio.h%""
 		alias
-			"FCGI_stderr"
+			"return FCGI_stderr;"
 		end
-		
 
 note
 	copyright: "Copyright (c) 1984-2011, Eiffel Software and others"

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

@@ -30,7 +30,12 @@ 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
 
 --	updated_environ_variables: HASH_TABLE [STRING, STRING]