Fix non-recognition of anchoring when preceded by (*MARK) etc.

ChangeLog

@@ -85,6 +85,9 @@ via a string callout.
 
 21. Improve MAP_JIT flag usage on MacOS. Patch by Rich Siegel.
 
+22. If a pattern started with (*MARK), (*COMMIT), (*PRUNE), (*SKIP), or (*THEN) 
+followed by ^ it was not recognized as anchored.
+
 
 Version 10.32 10-September-2018
 -------------------------------

src/pcre2_compile.c

@@ -4615,6 +4615,14 @@ for (;;)
     code += GET(code, 1) + 1 + LINK_SIZE;
     break;
 
+    case OP_MARK:
+    case OP_COMMIT_ARG:
+    case OP_PRUNE_ARG:
+    case OP_SKIP_ARG:
+    case OP_THEN_ARG:
+    code += code[1] + PRIV(OP_lengths)[*code];
+    break;
+
     default:
     return code;
     }

testdata/testinput2

@@ -5553,4 +5553,10 @@ a)"xI
 /foobar/g
     the foobar thing foobar again\=copy_matched_subject
 
+/(*:XX)^abc/I
+
+/(*COMMIT:XX)^abc/I
+
+/(*ACCEPT:XX)^abc/I
+
 # End of testinput2

testdata/testoutput2

@@ -16875,6 +16875,24 @@ Failed: error 128 at offset 14: assertion expected after (?( or (?(?C)
  0: foobar
  0: foobar
 
+/(*:XX)^abc/I
+Capturing subpattern count = 0
+Compile options: <none>
+Overall options: anchored
+First code unit = 'a'
+Subject length lower bound = 3
+
+/(*COMMIT:XX)^abc/I
+Capturing subpattern count = 0
+Compile options: <none>
+Overall options: anchored
+First code unit = 'a'
+Subject length lower bound = 3
+
+/(*ACCEPT:XX)^abc/I
+Capturing subpattern count = 0
+Subject length lower bound = 0
+
 # End of testinput2
 Error -70: PCRE2_ERROR_BADDATA (unknown error number)
 Error -62: bad serialized data