Revert "Merge branch 'main' into strerror (not PGP signed)"

This reverts commit 7e45af1bca, reversing
changes made to d87b5d0958.

Makefile

@@ -27,7 +27,7 @@ RUSTLIBS=--extern getopt=build/o/libgetopt.rlib \
 CFLAGS+=-I$(SYSEXITS)
 
 .PHONY: all
-all: dj false fop hru intcmp mm rpn scrut str strcmp swab true
+all: dj false fop hru intcmp rpn scrut str strcmp true
 
 build:
 	# keep build/include until bindgen(1) has stdin support
@@ -96,11 +96,6 @@ intcmp: build/bin/intcmp
 build/bin/intcmp: src/intcmp.c build
 	$(CC) $(CFLAGS) -o $@ src/intcmp.c
 
-.PHONY: mm
-mm: build/bin/mm
-build/bin/mm: src/mm.c build
-	$(CC) $(CFLAGS) -o $@ src/mm.c
-
 .PHONY: rpn
 rpn: build/bin/rpn
 build/bin/rpn: src/rpn.rs build rustlibs
@@ -121,13 +116,6 @@ strcmp: build/bin/strcmp
 build/bin/strcmp: src/strcmp.c build
 	$(CC) $(CFLAGS) -o $@ src/strcmp.c
 
-.PHONY: swab
-swab: build/bin/swab
-build/bin/swab: src/swab.rs build build/o/libsysexits.rlib
-	$(RUSTC) $(RUSTFLAGS) --extern getopt=build/o/libgetopt.rlib \
-		--extern sysexits=build/o/libsysexits.rlib \
-		-o $@ src/swab.rs
-
 .PHONY: true
 true: build/bin/true
 build/bin/true: src/true.c build