lib/agetpass.*: Remove malloc(3)-based APIs, as they're unused

In the last commit, we replaced all of these calls by alloca(3)-based
variants.

Signed-off-by: Alejandro Colomar <[email protected]>

Author: alejandro-colomar

lib/Makefile.am

@@ -27,8 +27,6 @@ libshadow_la_SOURCES = \
 	adds.c \
 	adds.h \
 	age.c \
-	agetpass.c \
-	agetpass.h \
 	alloc/calloc.c \
 	alloc/calloc.h \
 	alloc/malloc.c \