Avoid build errors due to wrong references between modules.

Avoid build errors due to wrong references between modules.

* lib/uninorm/canonical-decomposition.c: Include
"uninorm/decomposition-table.h", not "decomposition-table.h".
* lib/uninorm/decomposition.c: Likewise.
* lib/uninorm/u8-normalize.c: Include "uninorm/decompose-internal.h",
not "decompose-internal.h".
* lib/uninorm/u16-normalize.c: Likewise.
* lib/uninorm/u32-normalize.c: Likewise.
* lib/uninorm/uninorm-filter.c: Likewise.
* lib/uninorm/nfkc.c: Likewise.
* lib/uninorm/nfkd.c: Likewise.
* lib/unicase/u8-casemap.c: Include "unicase/caseprop.h", not
"caseprop.h".
* lib/unicase/u8-ct-totitle.c: Likewise.
* lib/unicase/u8-prefix-context.c: Likewise.
* lib/unicase/u8-suffix-context.c: Likewise.
* lib/unicase/u16-casemap.c: Likewise.
* lib/unicase/u16-ct-totitle.c: Likewise.
* lib/unicase/u16-prefix-context.c: Likewise.
* lib/unicase/u16-suffix-context.c: Likewise.
* lib/unicase/u32-casemap.c: Likewise.
* lib/unicase/u32-ct-totitle.c: Likewise.
* lib/unicase/u32-prefix-context.c: Likewise.
* lib/unicase/u32-suffix-context.c: Likewise.
* lib/unicase/u8-tolower.c: Include "unicase/unicasemap.h", not
"unicasemap.h".
* lib/unicase/u8-toupper.c: Likewise.
* lib/unicase/u8-ct-tolower.c: Likewise.
* lib/unicase/u8-ct-toupper.c: Likewise.
* lib/unicase/u16-tolower.c: Likewise.
* lib/unicase/u16-toupper.c: Likewise.
* lib/unicase/u16-ct-tolower.c: Likewise.
* lib/unicase/u16-ct-toupper.c: Likewise.
* lib/unicase/u32-tolower.c: Likewise.
* lib/unicase/u32-toupper.c: Likewise.
* lib/unicase/u32-ct-tolower.c: Likewise.
* lib/unicase/u32-ct-toupper.c: Likewise.
* lib/unicase/u8-ct-casefold.c: Include "unicase/unicasemap.h", not
"unicasemap.h", and "unicase/casefold.h", not "casefold.h".
* lib/unicase/u16-ct-casefold.c: Likewise.
* lib/unicase/u32-ct-casefold.c: Likewise.