dialog(1): switch off dialog(1) by default

Every direct consumers in base have switch to use bsddialog(1) by
default

share/mk/src.opts.mk

@@ -86,7 +86,6 @@ __DEFAULT_YES_OPTIONS = \
     CRYPT \
     CUSE \
     CXGBETOOL \
-    DIALOG \
     DICT \
     DMAGENT \
     DTRACE \
@@ -197,6 +196,7 @@ __DEFAULT_NO_OPTIONS = \
     BHYVE_SNAPSHOT \
     CLANG_EXTRAS \
     CLANG_FORMAT \
+    DIALOG \
     DETECT_TZ_CHANGES \
     DISK_IMAGE_TOOLS_BOOTSTRAP \
     DTRACE_ASAN \

tools/build/options/WITH_DIALOG

@@ -0,0 +1,6 @@
+Do build
+.Xr dialog 1 ,
+.Xr dialog 3 ,
+.Xr dpv 1 ,
+and
+.Xr dpv 3 .