Fix several "warning: no previous prototype for function".
* modules/unicase/locale-language (Makefile.am): Add a 'static' keyword
in front of the declaration of the lookup function in
unicase/locale-languages.h.
* modules/unictype/bidiclass-byname (Makefile.am): Likewise in
unictype/bidi_byname.h.
* modules/unictype/category-byname (Makefile.am): Likewise in
unictype/categ_byname.h.
* modules/unictype/combining-class-byname (Makefile.am): Likewise in
unictype/combiningclass_byname.h.
* modules/unictype/joininggroup-byname (Makefile.am): Likewise in
unictype/joininggroup_byname.h.
* modules/unictype/joiningtype-byname (Makefile.am): Likewise in
unictype/joiningtype_byname.h.
* modules/unictype/property-byname (Makefile.am): Likewise in
unictype/pr_byname.h.
* modules/unictype/scripts (Makefile.am): Likewise in
unictype/scripts_byname.h.
* modules/uninorm/composition (Makefile.am): Likewise in
uninorm/composition-table.h.