Remove unused static inline functions str_upcase_l() and 
str_downcase_l() that cause the compilation error:
'dereferencing pointer to incomplete type'.

Signed-off-by: Pedro Aguilar <paguilar@paguilar.org>

diff -Nau guile-2.0.11.orig/libguile/i18n.c guile-2.0.11/libguile/i18n.c
--- guile-2.0.11.orig/libguile/i18n.c	2014-01-21 22:25:11.000000000 +0100
+++ guile-2.0.11/libguile/i18n.c	2014-11-04 23:18:52.675435613 +0100
@@ -851,26 +851,6 @@
   *dst = '\0';
 }
 
-#ifdef USE_GNU_LOCALE_API
-static inline void
-str_upcase_l (register char *dst, register const char *src,
-	      scm_t_locale locale)
-{
-  for (; *src != '\0'; src++, dst++)
-    *dst = toupper_l (*src, locale);
-  *dst = '\0';
-}
-
-static inline void
-str_downcase_l (register char *dst, register const char *src,
-		scm_t_locale locale)
-{
-  for (; *src != '\0'; src++, dst++)
-    *dst = tolower_l (*src, locale);
-  *dst = '\0';
-}
-#endif
-
 
 SCM_DEFINE (scm_string_locale_lt, "string-locale<?", 2, 1, 0,
 	    (SCM s1, SCM s2, SCM locale),