[MLIR] Remove unnecessary include from MathToEmitC.h to fix build issue (llvm#125466)

This removes the unnecessary inclusion of mlir/Dialect/EmitC/IR/EmitC.h
from MathToEmitC.h, which caused a build failure due to a missing
EmitCEnums.h.inc. The include was not needed, and removing it resolves
the issue without requiring additional dependencies.

Author: recursion-man

mlir/include/mlir/Conversion/MathToEmitC/MathToEmitC.h

@@ -8,7 +8,6 @@
 
 #ifndef MLIR_CONVERSION_MATHTOEMITC_MATHTOEMITC_H
 #define MLIR_CONVERSION_MATHTOEMITC_MATHTOEMITC_H
-#include "mlir/Dialect/EmitC/IR/EmitC.h"
 namespace mlir {
 class RewritePatternSet;
 namespace emitc {