cmake: fix nasm detection w/3.0

nasm 3.0 separated Oflags (-Ox) output to `-hO` which is used to
validate the nasm binary. This change is compatible with older versions
(tested with NASM version 2.16.03 & 2.13.02).

Bug: aomedia:448994065
Fixed: aomedia:448994065
Change-Id: I704dcfe39ac6e68bc4d5b9e409fb59a0d277170e

build/cmake/aom_optimization.cmake

diff --git a/build/cmake/aom_optimization.cmake b/build/cmake/aom_optimization.cmake
index 9cc34de..2750a0b 100644
--- a/build/cmake/aom_optimization.cmake
+++ b/build/cmake/aom_optimization.cmake
@@ -212,7 +212,7 @@
 # Currently checks only for presence of required object formats and support for
 # the -Ox argument (multipass optimization).
 function(test_nasm)
-  execute_process(COMMAND ${CMAKE_ASM_NASM_COMPILER} -hf
+  execute_process(COMMAND ${CMAKE_ASM_NASM_COMPILER} -hO
                   OUTPUT_VARIABLE nasm_helptext)
 
   if(NOT "${nasm_helptext}" MATCHES "-Ox")
@@ -220,6 +220,8 @@
       FATAL_ERROR "Unsupported nasm: multipass optimization not supported.")
   endif()
 
+  execute_process(COMMAND ${CMAKE_ASM_NASM_COMPILER} -hf
+                  OUTPUT_VARIABLE nasm_helptext)
   if("${AOM_TARGET_CPU}" STREQUAL "x86")
     if("${AOM_TARGET_SYSTEM}" STREQUAL "Darwin")
       if(NOT "${nasm_helptext}" MATCHES "macho32")