Supress string_query function warning

[S-H-GAMELINKS]

Supress this warning for string_query function.

compiling ../../../../ext/prism/extension.c
../../../../ext/prism/extension.c: In function ‘string_query’:
../../../../ext/prism/extension.c:1156:1: warning: control reaches end of non-void function [-Wreturn-type]
 1156 | }
      | ^
../../../../ext/prism/extension.c: At top level:
cc1: note: unrecognized command-line option ‘-Wno-self-assign’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-parentheses-equality’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-constant-logical-operand’ may have been intended to silence earlier diagnostics