fix build by removing an outdated patch

doesn't build on the only arch affected, so no bump

graphics/opencv/patches/patch-modules_core_src_system_cpp

@@ -11,15 +11,6 @@ Index: modules/core/src/system.cpp
  #include <unistd.h>
  #include <stdio.h>
  #include <sys/types.h>
-@@ -563,7 +563,7 @@ struct HWFeatures
-         }
-     #endif // CV_CPUID_X86
- 
--    #if defined __ANDROID__ || defined __linux__ || defined __FreeBSD__ || defined __QNX__
-+    #if defined __ANDROID__ || defined __linux__ || defined __FreeBSD__ || defined __OpenBSD__ || defined __QNX__
-     #ifdef __aarch64__
-         have[CV_CPU_NEON] = true;
-         have[CV_CPU_FP16] = true;
 @@ -607,7 +607,7 @@ struct HWFeatures
          CV_LOG_INFO(NULL, "- FP16 instructions is NOT enabled via build flags");
          #endif