Fix uninited global var generation

src/c2v.v

@@ -1535,7 +1535,13 @@ fn (mut c C2V) var_decl(mut decl_stmt Node) {
 
 fn (mut c C2V) global_var_decl(mut var_decl Node) {
 	// if the global has children, that means it's initialized, parse the expression
-	is_inited := var_decl.inner.len > 0
+	mut is_inited := var_decl.inner.len > 0
+
+	if var_decl.inner.len == 1 {
+		if var_decl.inner[0].kindof(.visibility_attr) {
+			is_inited = false
+		}
+	}
 
 	vprintln('\nglobal name=${var_decl.name} typ=${var_decl.ast_type.qualified}')
 	vprintln(var_decl.str())

tests/21.header_uninited_global_var.h

@@ -0,0 +1,3 @@
+#define TS_CAPI	__attribute__ ((visibility("default")))
+
+TS_CAPI extern const char* tsMeshMaterialTypeBump;

tests/21.header_uninited_global_var.out

@@ -0,0 +1,2 @@
+[translated]
+module tests