Fix some missing 3.5 deprecation warning

I'm working on getting LibSass running against 3.5 and notice some
specs for `call` with a string didn't have deprecation warnings.

I wasn't able to use sass-spec to generate the warning either. Looks
like there is a bug with generate. I haven't investiaged further.

Closes sass#1039

spec/libsass-closed-issues/issue_1266/max-3.5/error

@@ -0,0 +1,6 @@
+DEPRECATION WARNING: Passing a string to call() is deprecated and will be illegal
+in Sass 4.0. Use call(get-function("max")) instead.
+
+Error: "blah" is not a number for `max'
+        on line 3 of spec/libsass-closed-issues/issue_1266/max-3.5/input.scss
+  Use --trace for backtrace.

spec/libsass-closed-issues/issue_1266/max-3.5/input.scss

@@ -0,0 +1,4 @@
+$foo: 1 2 3 blah 4;
+foo {
+  bar: call(max, $foo...);
+}

spec/libsass-closed-issues/issue_1266/max-3.5/options.yml

@@ -0,0 +1,4 @@
+---
+:start_version: '3.5'
+:warning_todo:
+- dart-sass

spec/libsass-closed-issues/issue_1266/max-3.5/status

@@ -0,0 +1 @@
+65

spec/libsass-closed-issues/issue_1266/max/options.yml

@@ -1,3 +1,4 @@
 ---
+:end_version: '3.4'
 :warning_todo:
 - dart-sass

spec/libsass-closed-issues/issue_1266/min-3.5/error

@@ -0,0 +1,6 @@
+DEPRECATION WARNING: Passing a string to call() is deprecated and will be illegal
+in Sass 4.0. Use call(get-function("min")) instead.
+
+Error: "blah" is not a number for `min'
+        on line 3 of spec/libsass-closed-issues/issue_1266/min-3.5/input.scss
+  Use --trace for backtrace.

spec/libsass-closed-issues/issue_1266/min-3.5/input.scss

@@ -0,0 +1,4 @@
+$foo: 1 2 3 blah 4;
+foo {
+  bar: call(min, $foo...);
+}

spec/libsass-closed-issues/issue_1266/min-3.5/options.yml

@@ -0,0 +1,4 @@
+---
+:start_version: '3.5'
+:warning_todo:
+- dart-sass

spec/libsass-closed-issues/issue_1266/min-3.5/status

@@ -0,0 +1 @@
+65

spec/libsass-closed-issues/issue_1266/min/options.yml

@@ -1,3 +1,4 @@
 ---
+:end_version: '3.4'
 :warning_todo:
 - dart-sass

spec/libsass-closed-issues/issue_1418/dynamic-3.5/error

@@ -0,0 +1,6 @@
+DEPRECATION WARNING: Passing a string to call() is deprecated and will be illegal
+in Sass 4.0. Use call(get-function("missing")) instead.
+
+Error: Function missing doesn't support keyword arguments
+        on line 2 of spec/libsass-closed-issues/issue_1418/dynamic-3.5/input.scss
+  Use --trace for backtrace.

spec/libsass-closed-issues/issue_1418/dynamic-3.5/input.scss

@@ -0,0 +1,3 @@
+foo {
+    color: call(missing, $a: b);
+}

spec/libsass-closed-issues/issue_1418/dynamic-3.5/options.yml

@@ -0,0 +1,3 @@
+---
+:start_version: '3.5'
+:end_version: '3.5'

spec/libsass-closed-issues/issue_1418/dynamic-3.5/status

@@ -0,0 +1 @@
+65

spec/libsass-closed-issues/issue_1418/dynamic-4.0/error

@@ -1,3 +1,6 @@
-Error: Plain CSS function missing doesn't support keyword arguments
+DEPRECATION WARNING: Passing a string to call() is deprecated and will be illegal
+in Sass 4.0. Use call(get-function("missing")) instead.
+
+Error: Function missing doesn't support keyword arguments
         on line 2 of /sass/spec/libsass-issues/issue_1418/dynamic-4.0/input.scss
   Use --trace for backtrace.

spec/libsass-closed-issues/issue_1418/dynamic/options.yml

@@ -1,2 +1,2 @@
 ---
-:end_version: '3.5'
+:end_version: '3.4'