Remove Debian packaging directory

This has been unmaintained and unused for a couple years now that
Macaulay2 is in the Debian/Ubuntu repositories and our PPA.

The Debian packaging code is available at
https://salsa.debian.org/math-team/macaulay2

Author: d-torrance

M2/configure.ac

@@ -509,17 +509,6 @@ AC_SUBST([GIT_DESCRIPTION],
 AC_SUBST([GIT_BRANCH],
          [`$GIT branch --show-current`])
 
-AC_SUBST(DEB,no)
-AC_ARG_ENABLE(deb,  AS_HELP_STRING(--enable-deb,prepare a *.deb package (for debian, ubuntu, ...)), DEB=$enableval)
-if test "$DEB" = yes 
-then if test "$OPTIMIZE" = no
-     then AC_MSG_ERROR([--disable-optimize and --enable-deb both specified])
-     fi
-     if test "$DEBUG" = yes
-     then AC_MSG_ERROR([--enable-debug and --enable-deb both specified])
-     fi
-fi
-
 AC_SUBST(FREEBSD,no)
 AC_ARG_ENABLE(freebsd,  AS_HELP_STRING(--enable-freebsd,prepare a package file for freebsd), FREEBSD=$enableval)
 if test "$FREEBSD" = yes 
@@ -1968,8 +1957,6 @@ fi
 test "$prefix" || prefix=/usr/local
 
 # for some distributions, we know what the prefix should be:
-test "$DEB"     = yes && test "$prefix" != /usr && 
-     AC_MSG_ERROR(--enable-deb specified and --prefix not set to /usr)
 test "$RPM"     = yes && test "$prefix" != /usr && 
      AC_MSG_ERROR(--enable-rpm specified and --prefix not set to /usr)
 

M2/distributions/Makefile.in

@@ -3,17 +3,12 @@ include ../include/config.Makefile
 VPATH = @srcdir@
 all:
 .PHONY: all
-$(foreach d,top tar deb freebsd rpm dmg,	\
+$(foreach d,top tar freebsd rpm dmg,	\
 	$(eval .PHONY: all-in-$d)		\
 	$(eval all-in-$d:; + $(MAKE) -C $d all))
 ifeq "@M2TARFILE@" "yes"
 all: all-in-tar
 endif
-ifeq "@DEB@" "yes"
-all: all-in-deb
-check: check-in-deb
-check-in-deb:; + $(MAKE) -C deb check
-endif
 ifeq "@FREEBSD@" "yes"
 all: all-in-freebsd
 endif
@@ -24,7 +19,7 @@ ifeq "@DMG@" "yes"
 all: all-in-dmg
 endif
 $(foreach t,clean distclean,						\
-   $(foreach d,dmg rpm deb freebsd tar top install, $(eval	\
+   $(foreach d,dmg rpm freebsd tar top install, $(eval	\
       .PHONY: $t $t-in-$d						\
 						          )$(eval	\
       $t: $t-in-$d							\