Bug 1991041 - Disable SVE parts of libyuv when the SVE flags are not supported. a=RyanVM DONTBUILD

While here, remove the LIBYUV_SVE define which is unused, and remove
the duplicate block adding it and the dependency on libyuv_sve.

Original Revision: https://phabricator.services.mozilla.com/D266315

Differential Revision: https://phabricator.services.mozilla.com/D266722

media/libyuv/03_add_neon64_and_sve_gyp_targets.patch

@@ -13,7 +13,7 @@ index 45df0d2e26192..e2aa2d7c69404 100644
            ],
            'conditions': [
              # Disable LTO in libyuv_neon target due to gcc 4.9 compiler bug.
-@@ -83,16 +81,6 @@
+@@ -108,16 +106,6 @@
                  '-ffat-lto-objects',
                ],
              }],
@@ -30,7 +30,19 @@ index 45df0d2e26192..e2aa2d7c69404 100644
            ],
          }],
          ['build_msa != 0', {
-@@ -162,12 +150,105 @@
+@@ -157,6 +145,11 @@
+             }],
+           ],
+         }],
++        ['target_arch == "arm64" and moz_have_arm_sve2 != 1 and build_with_mozilla == 1', {
++          'defines' :[
++            'LIBYUV_DISABLE_SVE',
++          ]
++        }],
+       ], #conditions
+       'defines': [
+         # Enable the following 3 macros to turn off assembly for specified CPU.
+@@ -186,12 +179,94 @@
                '-Wl,--dynamic-linker,/system/bin/linker',
              ],
            }],
@@ -43,17 +55,6 @@ index 45df0d2e26192..e2aa2d7c69404 100644
 +            'dependencies': [
 +                 ':libyuv_sve',
 +            ],
-+            'defines' :[
-+              'LIBYUV_SVE',
-+            ]
-+          }],
-+          ['target_arch == "arm64" and moz_have_arm_sve2 == 1 and build_with_mozilla == 1', {
-+            'dependencies': [
-+                 ':libyuv_sve',
-+            ],
-+            'defines' :[
-+              'LIBYUV_SVE',
-+            ]
 +          }],
          ], #conditions
        },

media/libyuv/libyuv/libyuv.gyp

@@ -130,6 +130,11 @@
             }],
           ],
         }],
+        ['target_arch == "arm64" and moz_have_arm_sve2 != 1 and build_with_mozilla == 1', {
+          'defines' :[
+            'LIBYUV_DISABLE_SVE',
+          ]
+        }],
       ], #conditions
       'defines': [
         'LIBYUV_DISABLE_SME',
@@ -170,17 +175,6 @@
             'dependencies': [
                  ':libyuv_sve',
             ],
-            'defines' :[
-              'LIBYUV_SVE',
-            ]
-          }],
-          ['target_arch == "arm64" and moz_have_arm_sve2 == 1 and build_with_mozilla == 1', {
-            'dependencies': [
-                 ':libyuv_sve',
-            ],
-            'defines' :[
-              'LIBYUV_SVE',
-            ]
           }],
         ], #conditions
       },