neon/ld3, neon/ld4: disable -Wmaybe-uninitialized on GCC

This is basically the same false positive as #657.  As of GCC 10 the
diagnostic is no longer emitted in C mode, but it is still emitted in
C++ mode, so I'm removing the version check from the ld3 code, too.

Fixes #676

arm/neon/ld3.h

@@ -33,7 +33,7 @@
 
 HEDLEY_DIAGNOSTIC_PUSH
 SIMDE_DISABLE_UNWANTED_DIAGNOSTICS
-#if defined(HEDLEY_GCC_VERSION) && !HEDLEY_GCC_VERSION_CHECK(10,0,0)
+#if defined(HEDLEY_GCC_VERSION)
   SIMDE_DIAGNOSTIC_DISABLE_MAYBE_UNINITIAZILED_
 #endif
 SIMDE_BEGIN_DECLS_

arm/neon/ld4.h

@@ -32,6 +32,9 @@
 
 HEDLEY_DIAGNOSTIC_PUSH
 SIMDE_DISABLE_UNWANTED_DIAGNOSTICS
+#if defined(HEDLEY_GCC_VERSION)
+  SIMDE_DIAGNOSTIC_DISABLE_MAYBE_UNINITIAZILED_
+#endif
 SIMDE_BEGIN_DECLS_
 
 #if !defined(SIMDE_BUG_INTEL_857088)