[lldb] Add missing include to SBLanguages.h

SBLanguages.h uses a uint16_t but is missing the include for
`<cstdint>`, if any file includes this without including that it will
cause a build error so this commit adds this include.

(cherry picked from commit f652fa4)

Author: chelcassanova

lldb/scripts/generate-sbapi-dwarf-enum.py

@@ -16,6 +16,8 @@
 #ifndef LLDB_API_SBLANGUAGE_H
 #define LLDB_API_SBLANGUAGE_H
 
+#include <cstdint>
+
 namespace lldb {
 /// Used by \\ref SBExpressionOptions.
 /// These enumerations use the same language enumerations as the DWARF