Fix build with Bionic libc

Add generic tests for fopen64 and fputs_unlocked functions to fix build
with Bionic libc that does not provide them.

* configure.ac (AC_CHECK_FUNCS): Add fopen64 and fputs_unlocked.
* strace.c [_LARGEFILE64_SOURCE]: Use fopen instead of fopen64
if !HAVE_FOPEN64.
Use fputs instead of fputs_unlocked if !HAVE_FPUTS_UNLOCKED.
* vsprintf.c: Use fputs instead of fputs_unlocked
if !HAVE_FPUTS_UNLOCKED.

Reported-by: Elliott Hughes <enh@google.com>

configure.ac

@@ -196,7 +196,9 @@ AC_CHECK_MEMBERS([struct sockaddr_in6.sin6_scope_id],,,
 AC_LITTLE_ENDIAN_LONG_LONG
 
 AC_CHECK_FUNCS(m4_normalize([
+	fopen64
 	fork
+	fputs_unlocked
 	if_indextoname
 	inet_ntop
 	prctl

strace.c

@@ -439,7 +439,11 @@ swap_uid(void)
 }
 
 #ifdef _LARGEFILE64_SOURCE
-# define fopen_for_output fopen64
+# ifdef HAVE_FOPEN64
+#  define fopen_for_output fopen64
+# else
+#  define fopen_for_output fopen
+# endif
 # define struct_stat struct stat64
 # define stat_file stat64
 # define struct_dirent struct dirent64
@@ -537,6 +541,10 @@ tprintf(const char *fmt, ...)
 	va_end(args);
 }
 
+#ifndef HAVE_FPUTS_UNLOCKED
+# define fputs_unlocked fputs
+#endif
+
 void
 tprints(const char *str)
 {

vsprintf.c

@@ -16,6 +16,10 @@
 #include <stdarg.h>
 #include <limits.h>
 
+#ifndef HAVE_FPUTS_UNLOCKED
+# define fputs_unlocked fputs
+#endif
+
 #define noinline_for_stack /*nothing*/
 #define likely(expr)       (expr)
 #define unlikely(expr)     (expr)