[mlir] Fix build error (NFC)

Summary:
/llvm-project/mlir/include/mlir/CAPI/Rewrite.h:21:63:
error: extra ';' outside of a function is incompatible with C++98 [-Werror,-Wc++98-compat-extra-semi]
DEFINE_C_API_PTR_METHODS(MlirRewriterBase, mlir::RewriterBase);
                                                              ^
1 error generated.

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Differential Revision: https://phabricator.intern.facebook.com/D60250959

Author: DamonFool

mlir/include/mlir/CAPI/Rewrite.h

@@ -18,6 +18,6 @@
 #include "mlir/CAPI/Wrap.h"
 #include "mlir/IR/PatternMatch.h"
 
-DEFINE_C_API_PTR_METHODS(MlirRewriterBase, mlir::RewriterBase);
+DEFINE_C_API_PTR_METHODS(MlirRewriterBase, mlir::RewriterBase)
 
 #endif // MLIR_CAPIREWRITER_H