nconfig: mark local functions as such

scripts/kconfig/nconf.gui.c:23: warning: no previous prototype for 'set_normal_colors'
scripts/kconfig/nconf.gui.c:68: warning: no previous prototype for 'normal_color_theme'
scripts/kconfig/nconf.gui.c:100: warning: no previous prototype for 'no_colors_theme'
scripts/kconfig/nconf.c:455: warning: no previous prototype for 'process_special_keys'
scripts/kconfig/nconf.c:487: warning: no previous prototype for 'get_next_hot'
scripts/kconfig/nconf.c:506: warning: no previous prototype for 'canbhot'
scripts/kconfig/nconf.c:514: warning: no previous prototype for 'is_hot'
scripts/kconfig/nconf.c:522: warning: no previous prototype for 'make_hot'
scripts/kconfig/nconf.c:582: warning: no previous prototype for 'item_make'
scripts/kconfig/nconf.c:626: warning: no previous prototype for 'item_add_str'
scripts/kconfig/nconf.c:656: warning: no previous prototype for 'item_tag'
scripts/kconfig/nconf.c:668: warning: no previous prototype for 'curses_item_index'
scripts/kconfig/nconf.c:673: warning: no previous prototype for 'item_data'
scripts/kconfig/nconf.c:684: warning: no previous prototype for 'item_is_tag'
scripts/kconfig/nconf.c:691: warning: no previous prototype for 'set_config_filename'

Signed-off-by: Michal Marek <mmarek@suse.cz>
diff --git a/scripts/kconfig/nconf.gui.c b/scripts/kconfig/nconf.gui.c
index 879ade6..115edb4 100644
--- a/scripts/kconfig/nconf.gui.c
+++ b/scripts/kconfig/nconf.gui.c
@@ -20,7 +20,7 @@
    COLOR_CYAN    6
    COLOR_WHITE   7
    */
-void set_normal_colors(void)
+static void set_normal_colors(void)
 {
 	init_pair(NORMAL, -1, -1);
 	init_pair(MAIN_HEADING, COLOR_MAGENTA, -1);
@@ -65,7 +65,7 @@
    A_CHARTEXT      Bit-mask to extract a character
    COLOR_PAIR(n)   Color-pair number n
    */
-void normal_color_theme(void)
+static void normal_color_theme(void)
 {
 	/* automatically add color... */
 #define mkattr(name, attr) do { \
@@ -97,7 +97,7 @@
 	mkattr(FUNCTION_TEXT, A_REVERSE);
 }
 
-void no_colors_theme(void)
+static void no_colors_theme(void)
 {
 	/* automatically add highlight, no color */
 #define mkattrn(name, attr) { attributes[name] = attr; }