patch 9.1.1877: cindent: wrong indentation after an array declaration

Problem:  cindent: wrong indentation after an array declaration
Solution: check if the filetype if javascript before matching the syntax
          (Anttoni Erkkilä)

cindent matches a javascript syntax for C files causing wrong
indentation in the following case:
```
void foo() {
float a[5],
b;
}
```

closes: #18631

Signed-off-by: Anttoni Erkkilä <anttoni.erkkila@protonmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/cindent.c

@@ -3476,7 +3476,7 @@ get_c_indent(void)
 			    amount = cur_amount;
 
 			    n = (int)STRLEN(l);
-			    if (terminated == ',' && (*skipwhite(l) == ']'
+			    if (curbuf->b_ind_js && terminated == ',' && (*skipwhite(l) == ']'
 					|| (n >=2 && l[n - 2] == ']')))
 				break;
 

src/testdir/test_cindent.vim

@@ -1106,6 +1106,11 @@ def Test_cindent_1()
   }
   }
 
+  void foo() {
+  float a[5],
+  b;
+  }
+
   /* end of AUTO */
   [CODE]
 
@@ -2083,6 +2088,11 @@ def Test_cindent_1()
   	}
   }
 
+  void foo() {
+  	float a[5],
+  		  b;
+  }
+
   /* end of AUTO */
 
   [CODE]

src/version.c

@@ -729,6 +729,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1877,
 /**/
     1876,
 /**/