all: update attributes to use new syntax

vlib/dl/dl.v

@@ -8,7 +8,7 @@ pub const rtld_next = voidptr(-1)
 
 // get_shared_library_extension returns the platform dependent shared library extension
 // i.e. .dll on windows, .so on most unixes, .dylib on macos.
-[inline]
+@[inline]
 pub fn get_shared_library_extension() string {
 	return $if windows {
 		'.dll'
@@ -21,7 +21,7 @@ pub fn get_shared_library_extension() string {
 
 // get_libname returns a library name with the operating system specific extension for
 // shared libraries.
-[inline]
+@[inline]
 pub fn get_libname(libname string) string {
 	return '${libname}${dl.dl_ext}'
 }

vlib/dl/loader/loader.v

@@ -1,4 +1,4 @@
-[has_globals]
+@[has_globals]
 module loader
 
 import dl
@@ -43,7 +43,7 @@ pub fn registered_dl_loader_keys() []string {
 }
 
 // DynamicLibLoader is a wrapper around dlopen, dlsym and dlclose.
-[heap]
+@[heap]
 pub struct DynamicLibLoader {
 pub:
 	key   string
@@ -55,7 +55,7 @@ mut:
 }
 
 // DynamicLibLoaderConfig is a configuration for DynamicLibLoader.
-[params]
+@[params]
 pub struct DynamicLibLoaderConfig {
 	// flags is the flags for dlopen.
 	flags int = dl.rtld_lazy