The AltiVec header typically defines the keywords "vector" and "bool" that
can be used within vector code, however this is not really compatible with
C++, so these tend to be undef'd in a C++ environment.

This is what happens here, at least in our specific environment, so use the
prefixed gcc/clang versions, which are available builtin, so the compilation
does not fail.

--- core/libs/facesengine/recognition/dlib-dnn/dnnface/dnn_base/simd4f.h
+++ core/libs/facesengine/recognition/dlib-dnn/dnnface/dnn_base/simd4f.h
@@ -109,7 +109,7 @@
     class simd4f
     {    
         typedef union {
-            vector float v;
+            __vector float v;
             float x[4];
         } v4f;
         
@@ -118,7 +118,7 @@
     public:
         inline simd4f() : x{0,0,0,0} {}
         inline simd4f(const simd4f& v) : x(v.x) { }
-        inline simd4f(const vector float& v) : x{v} { }
+        inline simd4f(const __vector float& v) : x{v} { }
 
         inline simd4f(const simd4i& v) {
             x.x[0]=v[0]; x.x[1]=v[1]; x.x[2]=v[2]; x.x[3]=v[3];
@@ -132,7 +132,7 @@
         inline simd4f& operator=(const simd4f& v) { x = v.x; return *this; }
         inline simd4f& operator=(const float& v) { *this = simd4f(v); return *this; }
 
-        inline vector float operator() () const { return x.v; }
+        inline __vector float operator() () const { return x.v; }
         inline float operator[](unsigned int idx) const { return x.x[idx]; }
         
         inline void load_aligned(const float* ptr)  { x.v = vec_ld(0, ptr); }
--- core/libs/facesengine/recognition/dlib-dnn/dnnface/dnn_base/simd4i.h
+++ core/libs/facesengine/recognition/dlib-dnn/dnnface/dnn_base/simd4i.h
@@ -73,8 +73,8 @@
     class simd4i
     {    
         typedef union {
-            vector signed int v;
-            vector bool int b;
+            __vector signed int v;
+            __vector __bool int b;
             signed int x[4];
         } v4i;
         
@@ -83,8 +83,8 @@
     public:
         inline simd4i() : x{0,0,0,0} { }
         inline simd4i(const simd4i& v) : x(v.x) { }
-        inline simd4i(const vector int& v) : x{v} { }
-        inline simd4i(const vector bool int& b) { x.b=b; }
+        inline simd4i(const __vector int& v) : x{v} { }
+        inline simd4i(const __vector __bool int& b) { x.b=b; }
 
         inline simd4i(int32 f) : x{f,f,f,f} { }
         inline simd4i(int32 r0, int32 r1, int32 r2, int32 r3)
@@ -93,10 +93,10 @@
         inline simd4i& operator=(const simd4i& v) { x = v.x; return *this; }
         inline simd4i& operator=(const int32& v) { *this = simd4i(v); return *this; }
 
-        inline vector signed int operator() () const { return x.v; }
+        inline __vector signed int operator() () const { return x.v; }
         inline int32 operator[](unsigned int idx) const { return x.x[idx]; }
         
-        inline vector bool int to_bool() const { return x.b; }
+        inline __vector __bool int to_bool() const { return x.b; }
         
         // intrinsics now seem to use xxpermdi automatically now
         inline void load_aligned(const int32* ptr)  { x.v = vec_ld(0, ptr); }
@@ -230,7 +230,7 @@
                       _lhs[2]*_rhs[2],
                       _lhs[3]*_rhs[3]);
 #elif defined(DLIB_HAVE_VSX)
-        vector int a = lhs(), b = rhs();
+        __vector int a = lhs(), b = rhs();
         asm("vmuluwm %0, %0, %1\n\t" : "+&v" (a) : "v" (b) );
         return simd4i(a);
 #else