Avoid the need for AC_LIBSOURCES in m4 macros.

Avoid the need for AC_LIBSOURCES in m4 macros.
* modules/arcfour (EXTRA_DIST): Add arcfour.h.
* modules/arctwo (EXTRA_DIST): Add arctwo.h.
* modules/check-version (EXTRA_DIST): Add check-version.h.
* modules/crc (EXTRA_DIST): Add crc.h.
* modules/des (EXTRA_DIST): Add des.h.
* modules/gc (EXTRA_DIST): Add gc.h.
* modules/getdelim (EXTRA_DIST): Add getdelim.h.
* modules/getline (EXTRA_DIST): Add getline.h.
* modules/getlogin_r (EXTRA_DIST): Add getlogin_r.h.
* modules/hmac-md5 (EXTRA_DIST): Add hmac.h.
* modules/hmac-sha1 (EXTRA_DIST): Add hmac.h.
* modules/md2 (EXTRA_DIST): Add md2.h.
* modules/md4 (EXTRA_DIST): Add md4.h.
* modules/pagealign_alloc (EXTRA_DIST): Add pagealign_alloc.h.
* modules/read-file (EXTRA_DIST): Add read-file.h.
* modules/readline (EXTRA_DIST): Add readline.h.
* modules/rijndael (EXTRA_DIST): Add rijndael-alg-fst.h,
rijndael-api-fst.h.

* m4/rijndael.m4 (gl_ARCFOUR):
* m4/arctwo.m4 (gl_ARCTWO):
* m4/check-version.m4 (gl_CHECK_VERSION):
* m4/crc.m4 (gl_CRC):
* m4/des.m4 (gl_DES):
* m4/gc-pbkdf2-sha1.m4 (gl_GC_PBKDF2_SHA1):
* m4/gc.m4 (gl_GC):
* m4/getdelim.m4 (gl_FUNC_GETDELIM):
* m4/getline.m4 (gl_FUNC_GETLINE):
* m4/getlogin_r.m4 (gl_GETLOGIN_R_SUBSTITUTE):
* m4/hmac-md5.m4 (gl_HMAC_MD5):
* m4/hmac-sha1.m4 (gl_HMAC_SHA1):
* m4/md2.m4 (gl_MD2):
* m4/md4.m4 (gl_MD4):
* m4/pagealign_alloc.m4 (gl_PAGEALIGN_ALLOC):
* m4/read-file.m4 (gl_FUNC_READ_FILE):
* m4/readline.m4 (gl_FUNC_READLINE):
* m4/rijndael.m4 (gl_RIJNDAEL):
Don't use AC_LIBSOURCES; instead, rely on the files in ../modules/
to get the necessary .h files and whatnot.