ldso: fix compiler errors with C++11

The warning

  error: expected unqualified-id before ‘STRING_USERDEF’ token

was caused by a missing whitespace in 'extern "C"int'.

os/src/lib/ldso/file.cc

@@ -195,7 +195,7 @@ namespace Genode {
 }
 
 
-extern "C"int open(const char *pathname, int flags)
+extern "C" int open(const char *pathname, int flags)
 {
 	using namespace Genode;
 	static int fd = -1;

os/src/lib/ldso/stdio.cc

@@ -26,7 +26,7 @@ extern "C" int printf(char const *format, ...)
 	return 0;
 }
 
-extern "C"inline
+extern "C" inline
 int vprintf(const char *format, va_list ap) 
 {
 	Genode::vprintf(format, ap);