libdpkg: Rename mlib module to mustlib

This should make the module purpose more clear from its name alone, and
avoids potential confusion with memory handling or similar.

TODO

@@ -37,7 +37,7 @@ Tasks
    - Get rid of static variables inside functions.
    - Coalesce hash and checksum functions.
    - Split modstatdb_rw into mode and flags.
-   - Move fd function out of mlib.
+   - Move fd function out of mustlib.
    - Cleanup status chars -> strings hardcoded mappings all over the place.
      (Fix tied field enum with its dselect description (pkgdisplay.cc))
    - Refactor src/unpack.c.

lib/dpkg/Makefile.am

@@ -89,7 +89,7 @@ libdpkg_la_SOURCES = \
 	i18n.c i18n.h \
 	log.c \
 	meminfo.c \
-	mlib.c \
+	mustlib.c \
 	namevalue.c \
 	nfmalloc.c \
 	options.c \

lib/dpkg/dpkg.h

@@ -135,7 +135,7 @@ void cu_closedir(int argc, void **argv);
 void cu_closefd(int argc, void **argv);
 void cu_filename(int argc, void **argv);
 
-/*** from mlib.c ***/
+/*** from mustlib.c ***/
 
 void setcloexec(int fd, const char *fn);
 void *m_malloc(size_t);

lib/dpkg/mlib.c → lib/dpkg/mustlib.c

 /*
  * libdpkg - Debian packaging suite library routines
- * mlib.c - ‘must’ library: routines will succeed or longjmp
+ * mustlib.c - ‘must’ library: routines will succeed or longjmp
  *
  * Copyright © 1994,1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
  * Copyright © 2006-2013, 2015 Guillem Jover <guillem@debian.org>

po/POTFILES.in

@@ -34,7 +34,7 @@ lib/dpkg/fsys-hash.c
 lib/dpkg/glob.c
 lib/dpkg/i18n.c
 lib/dpkg/log.c
-lib/dpkg/mlib.c
+lib/dpkg/mustlib.c
 lib/dpkg/namevalue.c
 lib/dpkg/nfmalloc.c
 lib/dpkg/options-parsers.c