aom_ports.cmake: don't add x86_abi_support.asm to source list x2

this avoids compilation failures when projects enable ASM language
support in project(). this file was never included in libaom_srcs.*

aom & aom_static were missed in the removal from aom_ports in:
676f00c61 aom_ports.cmake: don't add x86_abi_support.asm to source list

Bug: aomedia:3201
Change-Id: Id26e7a02955eab43c83ca26bd414fe34d4b34e50
(cherry picked from commit 8cba6495dd1bb9cbd59f96548583779eb6bcb2dc)

aom_ports/aom_ports.cmake

diff --git a/aom_ports/aom_ports.cmake b/aom_ports/aom_ports.cmake
index 5e553ae..b4cceb7 100644
--- a/aom_ports/aom_ports.cmake
+++ b/aom_ports/aom_ports.cmake
@@ -61,12 +61,12 @@
     endif()
   endif()
 
+  # Note AOM_PORTS_INCLUDES_X86 are not added to the aom_ports, aom or
+  # aom_static targets to avoid compilation issues in projects that enable ASM
+  # language support in project(). These sources were never included in
+  # libaom_srcs.*; if it becomes necessary for a particular generator another
+  # method should be used.
   if(aom_ports_has_symbols)
-    # Note AOM_PORTS_INCLUDES_X86 are not added to the aom_ports target to avoid
-    # compilation issues in projects that enable ASM language support in
-    # project(). These sources were never included in libaom_srcs.*; if it
-    # becomes necessary for a particular generator another method should be
-    # used.
     target_sources(aom_ports PRIVATE ${AOM_PORTS_INCLUDES})
     set(AOM_LIB_TARGETS ${AOM_LIB_TARGETS} PARENT_SCOPE)
   else()
@@ -74,13 +74,5 @@
     if(BUILD_SHARED_LIBS)
       target_sources(aom_static PRIVATE ${AOM_PORTS_INCLUDES})
     endif()
-
-    if("${AOM_TARGET_CPU}" STREQUAL "x86"
-       OR "${AOM_TARGET_CPU}" STREQUAL "x86_64")
-      target_sources(aom PRIVATE ${AOM_PORTS_INCLUDES_X86})
-      if(BUILD_SHARED_LIBS)
-        target_sources(aom_static PRIVATE ${AOM_PORTS_INCLUDES_X86})
-      endif()
-    endif()
   endif()
 endfunction()