wasm: only compile .wasm.v, and platform independent .v files (#26386)

Author: SurmanPP

vlib/v/pref/should_compile.v

@@ -69,6 +69,9 @@ pub fn (prefs &Preferences) should_compile_filtered_files(dir string, files_ []s
 		if !prefs.backend.is_js() && !prefs.should_compile_asm(file) {
 			continue
 		}
+		if prefs.backend == .wasm && !prefs.should_compile_wasm(file) {
+			continue
+		}
 		if file.starts_with('.#') {
 			continue
 		}
@@ -287,6 +290,14 @@ pub fn (prefs &Preferences) should_compile_js(file string) bool {
 	return true
 }
 
+pub fn (prefs &Preferences) should_compile_wasm(file string) bool {
+	if !file.ends_with('.wasm.v') && file.count('.') >= 2 {
+		// not .wasm.v not just .v something else like .c.v
+		return false
+	}
+	return true
+}
+
 // is_target_of returns true if this_os is included in the target specified
 // for example, 'nix' is true for Linux and FreeBSD but not Windows
 pub fn (this_os OS) is_target_of(target string) bool {