Increase MAX command, and arg., length: 64 -> 256

With non-standard paths, e.g., when running `make distcheck`, the
absolute path to some commands become ridiculously long.  However,
this has been a recurring issue for some users in the past, so it
is time to increase the capabilibieies of Finit to cover this.

Yes, a better way is probably to allocate all these strings when they
are used, but that would require a redesign of the initctl API and
likely cause a lot of regressions before everything has stabilized.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/finit.h

@@ -60,7 +60,7 @@
 #define _PATH_SULOGIN           FINIT_EXECPATH_ "/sulogin"
 #define _PATH_GETTY             FINIT_EXECPATH_ "/getty"
 
-#define CMD_SIZE                256
+#define CMD_SIZE                1024
 #define LINE_SIZE               1024
 #define BUF_SIZE                4096