Fix how 1988/applin/zsmall.c is built

To match the rest of the repository with alternate code (where possible)
the file is now applin.alt.c. However the rule in the Makefile copies
the file to zsmall.c and builds it accordingly, compiling into
applin.alt.

.gitignore has had applin.alt added to it.

1988/applin/.gitignore

@@ -1,3 +1,4 @@
 applin
 large.c
 zsmall
+applin.alt

1988/applin/Makefile

@@ -111,8 +111,8 @@ OBJ= ${PROG}.o
 DATA=
 TARGET= ${PROG}
 #
-ALT_OBJ= zsmall.o
-ALT_TARGET= zsmall
+ALT_OBJ= applin.alt.o
+ALT_TARGET= applin.alt
 
 
 #################
@@ -147,6 +147,10 @@ ${PROG}: ${PROG}.c
 alt: data ${ALT_TARGET}
 	@${TRUE}
 
+${ALT_TARGET}: ${PROG}.alt.c
+	${CP} -f ${PROG}.alt.c zsmall.c
+	${CC} ${CFLAGS} zsmall.c -o $@
+
 # not an official entry
 #
 # The 'zsmall.c' program was obtained from 'applin.c' by reducing its recursion

1988/applin/README.md

@@ -10,12 +10,28 @@ US
 make all
 ```
 
+A smaller version, originally called `zsmall.c`, of [applin.c](applin.c) can be
+found in [applin.alt.c](applin.alt.c).  Your machine may have an easier time
+with this program.  See the Alternate code section below for details.
+
 ## Try:
 
 ```sh
 ./applin
 ```
 
+### Alternate code:
+
+As noted above a smaller version can be used in case your cpp has a hard time
+with this entry. To use:
+
+```sh
+make alt
+```
+
+Use `applin.alt` as you would `applin` above.
+
+
 ## Judges' remarks:
 
 This entry is by far the most unusual abuse of the C preprocessor that
@@ -34,9 +50,6 @@ on the Amdahl 5890-300E.  But due to the ANSI-likeness of GNU cpp (v. 1-21),
 it was not able to cleanly substitute a symbol that began with a '#'.
 Clearly the GNU C preprocessor is faster.
 
-A smaller version of [applin.c](applin.c) can be found in [zsmall.c](zsmall.c).
-Your machine may have an easier time with this program.  See the Makefile for
-details.
 
 ## Author's remarks: