Added code optimization for OpenCV compilation

- Changed -DCV_DISABLE_OPTIMIZATION to OFF
- This re-enable code optimization (dispatched code/intrinsics/loop unrolling/etc)

esp32/examples/esp_opencv_tests/main/opencv/opencv2/core/utils/allocator_stats.impl.hpp

@@ -21,7 +21,8 @@ class AllocatorStatistics : public AllocatorStatisticsInterface
 {
 protected:
 #ifdef CV_CXX11
-    std::atomic<long> curr, total, total_allocs, peak;      // ESP32 modification (from <long long> to <long>)
+    // std::atomic<long long> curr, total, total_allocs, peak; 
+    std::atomic<long> curr, total, total_allocs, peak;      // esp32 doesn't support hardware 64bit atomic. FIXME: add software support
 #else
     volatile long long curr, total, total_allocs, peak;  // overflow is possible, CV_XADD operates with 'int' only
 #endif

esp32/examples/esp_opencv_tests/main/opencv/opencv2/cvconfig.h

@@ -8,7 +8,7 @@
 /* #undef CV_ENABLE_INTRINSICS */
 
 /* OpenCV additional optimized code */
-#define CV_DISABLE_OPTIMIZATION
+/* #undef CV_DISABLE_OPTIMIZATION */
 
 /* Compile for 'real' NVIDIA GPU architectures */
 #define CUDA_ARCH_BIN ""