Remove -dead_strip_dylibs from LDFLAGS when building on mac to solve linking issue with mkl.

conda/opencv/build.sh

@@ -34,6 +34,9 @@ if [ "${SHORT_OS_STR}" == "Darwin" ]; then
     # The default flag as of OpenCV 3.4.4 are:
     # CPU_DISPATCH:STRING=SSE4_1;SSE4_2;AVX;FP16;AVX2;AVX512_SKX
     CPU_DISPATCH_FLAGS="-DCPU_DISPATCH=SSE4_1;SSE4_2;AVX;FP16"
+    # remove -dead_strip_dylibs from LDFLAGS if it exists
+    export LDFLAGS:=$(filter-out "-dead_strip_dylibs",$(LDFLAGS))
+
 fi
 
 if [ "${MACHINE_STR}" == "aarch64" ] || [ "${MACHINE_STR:0:3}" == "arm" ] || [ "${MACHINE_STR:0:3}" == "ppc" ]; then