lib, libmisc: Move source files to lib (where their headers were)

Scripted change:

$ find lib/ -type f \
| grep '\.h$' \
| sed 's,lib/,libmisc/,' \
| sed 's,\.h$,.c,' \
| xargs find 2>/dev/null \
| xargs mv -t lib/;

Plus updating the Makefiles.

Closes: <https://github.com/shadow-maint/shadow/issues/791>
Closes: <https://bugs.gentoo.org/912446>
Link: <https://github.com/shadow-maint/shadow/issues/763#issuecomment-1664383425>
Link: <https://github.com/shadow-maint/shadow/pull/776>
Link: <https://github.com/shadow-maint/shadow/commit/d0518cc250afeaceb772a7f50a900cfc9b3ab937>
Reported-by: Christian Bricart <christian@bricart.de>
Reported-by: Robert Marmorstein <robert@marmorstein.org>
Cc: Sam James <sam@gentoo.org>
[ jubalh tested the openSUSE package ]
Tested-by: Michael Vetter <jubalh@iodoru.org>
Acked-by: Michael Vetter <jubalh@iodoru.org>
[ Robert F. tested the Gentoo package ]
Tested-by: Robert Förster <Dessa@gmake.de>
Cc: David Seifert <soap@gentoo.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>

lib/Makefile.am

@@ -14,6 +14,10 @@ libshadow_la_CPPFLAGS += -I$(top_srcdir)
 libshadow_la_CFLAGS = $(LIBBSD_CFLAGS)
 
 libshadow_la_SOURCES = \
+	alloc.c \
+	alloc.h \
+	bit.c \
+	bit.h \
 	commonio.c \
 	commonio.h \
 	defines.h \
@@ -34,6 +38,8 @@ libshadow_la_SOURCES = \
 	groupio.h \
 	gshadow.c \
 	lockpw.c \
+	mempcpy.c \
+	mempcpy.h \
 	nss.c \
 	nscd.c \
 	nscd.h \
@@ -67,6 +73,10 @@ libshadow_la_SOURCES = \
 	shadowio.h \
 	shadowmem.c \
 	spawn.c \
+	stpecpy.c \
+	stpecpy.h \
+	stpeprintf.c \
+	stpeprintf.h \
 	write_full.c
 
 if WITH_TCB

libmisc/Makefile.am

@@ -16,12 +16,8 @@ libmisc_la_SOURCES = \
 	addgrps.c \
 	age.c \
 	agetpass.c \
-	alloc.c \
-	../lib/alloc.h \
 	audit_help.c \
 	basename.c \
-	bit.c \
-	../lib/bit.h \
 	chkname.c \
 	chkname.h \
 	chowndir.c \
@@ -53,7 +49,6 @@ libmisc_la_SOURCES = \
 	list.c \
 	loginprompt.c \
 	mail.c \
-	mempcpy.c \
 	motd.c \
 	myname.c \
 	obscure.c \
@@ -71,10 +66,6 @@ libmisc_la_SOURCES = \
 	setugid.c \
 	setupenv.c \
 	shell.c \
-	stpecpy.c \
-	../lib/stpecpy.h \
-	stpeprintf.c \
-	../lib/stpeprintf.h \
 	strtoday.c \
 	sub.c \
 	sulog.c \