patch 9.0.1234: the code style has to be checked manually

Problem:    The code style has to be checked manually.
Solution:   Add basic code style checks in a test.  Fix or avoid uncovered
            problems.
diff --git a/src/optiondefs.h b/src/optiondefs.h
index 4d12e25..7ec4847 100644
--- a/src/optiondefs.h
+++ b/src/optiondefs.h
@@ -2849,7 +2849,8 @@
 			    {(char_u *)TRUE, (char_u *)0L} SCTX_INIT},
 
 // terminal output codes
-#define p_term(sss, vvv)   {sss, NULL, P_STRING|P_VI_DEF|P_RALL|P_SECURE, \
+#define p_term(sss, vvv) \
+			    {sss, NULL, P_STRING|P_VI_DEF|P_RALL|P_SECURE, \
 			    (char_u *)&vvv, PV_NONE, \
 			    {(char_u *)"", (char_u *)0L} SCTX_INIT},