Use precision for samples only when #version 300 es

Fix #10332

drivers/gles3/shader_gles3.cpp

@@ -273,9 +273,11 @@ ShaderGLES3::Version *ShaderGLES3::get_current_version() {
 	//vertex precision is high
 	strings.push_back("precision highp float;\n");
 	strings.push_back("precision highp int;\n");
+#ifndef GLES_OVER_GL
 	strings.push_back("precision highp sampler2D;\n");
 	strings.push_back("precision highp samplerCube;\n");
 	strings.push_back("precision highp sampler2DArray;\n");
+#endif
 
 #if 0
 	if (cc) {
@@ -374,9 +376,11 @@ ShaderGLES3::Version *ShaderGLES3::get_current_version() {
 	//fragment precision is medium
 	strings.push_back("precision highp float;\n");
 	strings.push_back("precision highp int;\n");
+#ifndef GLES_OVER_GL
 	strings.push_back("precision highp sampler2D;\n");
 	strings.push_back("precision highp samplerCube;\n");
 	strings.push_back("precision highp sampler2DArray;\n");
+#endif
 
 #if 0
 	if (cc) {