loadtools/scripts: gtm900.config renamed to gen4.config It turns out that a GTM900 variant exists with 8 MiB flash, thus -h gen8 needs to be used for GTM900 modules as the general case, and the old -h gtm900 config is best renamed to -h gen4, although not currently official for any actual target.

#define	MAX_FN_COMPONENT	20
#define	MAX_DIR_NEST		6
#define	PATHNAME_BUF_SIZE	((MAX_FN_COMPONENT+1) * (MAX_DIR_NEST+1) + 1)