libxbps: hide compat symbols.

lib/compat/strcasestr.c

@@ -40,7 +40,7 @@
 /*
  * Find the first occurrence of find in s, ignore case.
  */
-char *
+char HIDDEN *
 strcasestr(const char *s, const char *find)
 {
 	char c, sc;

lib/compat/strlcat.c

@@ -28,7 +28,7 @@
  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
  * If retval >= siz, truncation occurred.
  */
-size_t
+size_t HIDDEN
 strlcat(char *dst, const char *src, size_t siz)
 {
 	char *d = dst;

lib/compat/strlcpy.c

@@ -26,7 +26,7 @@
  * will be copied.  Always NUL terminates (unless siz == 0).
  * Returns strlen(src); if retval >= siz, truncation occurred.
  */
-size_t
+size_t HIDDEN
 strlcpy(char *dst, const char *src, size_t siz)
 {
 	char *d = dst;

lib/compat/vasprintf.c

@@ -33,7 +33,7 @@
 #include <stdlib.h>
 #include <stdarg.h>
 
-int
+int HIDDEN
 vasprintf(char **ret, const char *fmt, va_list ap)
 {
 	char *buf, *new_buf;