Support building on Android arm aarch64 x86 x86_64

1. Add cmake support in CMakeLists.txt according to https://developer.android.com/ndk/guides/other_build_systems

2. Resolve symbols errors

3. Backport fixes from 438ed42311

   > QEMU relies on two optimization for ppc64 and arm:
   >
   > 1. if(0) /* optimized code */
   > 2. assert(0); /* optimized code */
   >
   > But the assert on mingw32 doesn't have noreturn attribute which prevents
   > the second optimization and some code is reverted to the original code
   > to fit in the first optimization.
   >
   > The assert implementation is copied from glib as qemu did.

   Unfortunately, NDK also doesn't have an assert implementation qemu prefers.

qemu/target/arm/cpu.c

@@ -143,8 +143,8 @@ static void cp_reg_check_reset(gpointer key, gpointer value,  gpointer opaque)
     cp_reg_reset(key, value, opaque);
 #ifndef NDEBUG
     newvalue = read_raw_cp_reg(&cpu->env, ri);
-#endif
     assert(oldvalue == newvalue);
+#endif
 }
 
 static void arm_cpu_reset(CPUState *dev)
@@ -919,7 +919,9 @@ void arm_cpu_realizefn(struct uc_struct *uc, CPUState *dev)
          * Presence of EL2 itself is ARM_FEATURE_EL2, and of the
          * Security Extensions is ARM_FEATURE_EL3.
          */
+#ifndef NDEBUG
         assert(no_aa32 || cpu_isar_feature(aa32_arm_div, cpu));
+#endif
         set_feature(env, ARM_FEATURE_LPAE);
         set_feature(env, ARM_FEATURE_V7);
     }
@@ -945,7 +947,9 @@ void arm_cpu_realizefn(struct uc_struct *uc, CPUState *dev)
     if (arm_feature(env, ARM_FEATURE_V6)) {
         set_feature(env, ARM_FEATURE_V5);
         if (!arm_feature(env, ARM_FEATURE_M)) {
+#ifndef NDEBUG
             assert(no_aa32 || cpu_isar_feature(aa32_jazelle, cpu));
+#endif
             set_feature(env, ARM_FEATURE_AUXCR);
         }
     }

qemu/target/arm/helper.c

@@ -6027,12 +6027,11 @@ static void define_debug_regs(ARMCPU *cpu)
     wrps = arm_num_wrps(cpu);
 #ifndef NDEBUG
     ctx_cmps = arm_num_ctx_cmps(cpu);
+    assert(ctx_cmps <= brps);
 #else
     arm_num_ctx_cmps(cpu);
 #endif
 
-    assert(ctx_cmps <= brps);
-
     define_one_arm_cp_reg(cpu, &dbgdidr);
     define_arm_cp_regs(cpu, debug_cp_reginfo);
 

qemu/target/ppc/mmu-hash64.c

@@ -1172,7 +1172,9 @@ void ppc_hash64_init(PowerPCCPU *cpu)
     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
 
     if (!pcc->hash64_opts) {
+#ifndef NDEBUG
         assert(!(env->mmu_model & POWERPC_MMU_64));
+#endif
         return;
     }