Ugly workaround for locale issue breaking HW transform for some people

GPU/GLES/VertexShaderGenerator.cpp

@@ -16,6 +16,8 @@
 // https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
 
 #include <stdio.h>
+#include <locale.h>
+
 #if defined(_WIN32) && defined(_DEBUG)
 #include <windows.h>
 #endif
@@ -132,6 +134,10 @@ enum DoLightComputation {
 };
 
 void GenerateVertexShader(int prim, char *buffer) {
+	// Apparently, sprintf can output "," unless we do this, which is a disaster for this line later on:
+	// WRITE(p, "  worldpos = (u_world * vec4(worldpos * %f, 1.0)).xyz;\n", factor);
+	setlocale( LC_ALL, "C" );
+
 	char *p = buffer;
 #if defined(USING_GLES2)
 	WRITE(p, "precision highp float;\n");