[importc]: Fix math.h on glibc aarch64

Signed-off-by: Andrei Horodniceanu <a.horodniceanu@proton.me>

Author: the-horo

runtime/druntime/src/__importc_builtins.di

@@ -193,3 +193,10 @@ else version (LDC)
     version (X86)    public import ldc.gccbuiltins_x86;
     version (X86_64) public import ldc.gccbuiltins_x86;
 }
+
+version (CRuntime_Glibc) version (AArch64)
+{
+    // math.h needs these
+    alias __Float32x4_t = __vector(float[4]);
+    alias __Float64x2_t = __vector(double[2]);
+}

runtime/druntime/src/importc.h

@@ -187,8 +187,16 @@ typedef unsigned long long __uint64_t;
 #define _Float128 long double
 #define __float128 long double
 #endif
+
+#ifdef __aarch64__
+// glibc's math.h needs these types to be defined
+typedef struct {} __SVBool_t;
+typedef struct {} __SVFloat32_t;
+typedef struct {} __SVFloat64_t;
 #endif
 
+#endif // __linux__
+
 #if __APPLE__
 #undef __SIZEOF_INT128__
 #endif