Fix SyntaxError caused by template literal mangling regex backslashes (#235)

A plain template literal processes escape sequences, turning /\*/g into
/*/g and /\?/g into /?/g — both invalid regexes that cause eval() to
throw "Invalid or unexpected token".

Fix: use String.raw`...` in pac_utils_dump.c so the JS source is stored
verbatim with all backslashes preserved.

Author: manugarg

src/pac_utils_dump.c

@@ -16,7 +16,9 @@ int main() {
     printf("// directly, so that the eval'd PAC sandbox can define its own\n");
     printf("// dnsResolve() / myIpAddress() in the same scope as the utility\n");
     printf("// functions — keeping DNS mocking correct via lexical scoping.\n");
-    printf("const PAC_UTILS_JS = `\n");
+    // String.raw preserves backslashes as-is, preventing the JS template
+    // literal parser from mangling regex patterns like /\*/g → /*/g (invalid).
+    printf("const PAC_UTILS_JS = String.raw`\n");
     printf("%s", pacUtils);
     printf("`;\n");
     return 0;

web/pac_utils.js

@@ -5,7 +5,7 @@
 // directly, so that the eval'd PAC sandbox can define its own
 // dnsResolve() / myIpAddress() in the same scope as the utility
 // functions — keeping DNS mocking correct via lexical scoping.
-const PAC_UTILS_JS = `
+const PAC_UTILS_JS = String.raw`
 function dnsDomainIs(host, domain) {
     return (host.length >= domain.length &&
             host.substring(host.length - domain.length) == domain);