removed obsolete "ENABLE_MONGODB" option

doc/build_osx.md

@@ -55,11 +55,6 @@ export CC=gcc-6
 export CXX=g++-6
 ```
 
-## Disable MongoDB binding
-```
-export ENABLE_MONGODB=0
-```
-
 ## Detect number of threads
 
 ```

doc/getting_started/getting_started_en.md

@@ -33,7 +33,7 @@ https://github.com/yandex/ClickHouse/blob/master/doc/build.md
 
 Install required packages. After that let's run the following command from directory with source code of ClickHouse:
 ```
-~/ClickHouse$ ENABLE_MONGODB=0 ./release --standalone
+~/ClickHouse$ ./release --standalone
 ```
 
 The build successfully completed:

doc/getting_started/getting_started_ru.md

@@ -33,7 +33,7 @@ https://github.com/yandex/ClickHouse/blob/master/doc/build.md
 
 Установим необходимые пакеты. После этого выполним следующую команду из директории с исходными кодами ClickHouse:
 ```
-~/ClickHouse$ ENABLE_MONGODB=0 ./release --standalone
+~/ClickHouse$ ./release --standalone
 ```
 
 Сборка успешно завершена:

release

@@ -60,7 +60,7 @@ make_control "$CONTROL" "$DAEMONS"
 gen_changelog "$REVISION" "$CHDATE" "$AUTHOR" "$CHLOG" "$DAEMONS"
 
 # Build (only binary packages).
-debuild -e DAEMONS="${DAEMONS}" -e ENABLE_MONGODB -e GLIBC_COMPATIBILITY -e CC -e CXX -b ${DEBUILD_NOSIGN_OPTIONS} ${DEBUILD_NODEPS_OPTIONS}
+debuild -e DAEMONS="${DAEMONS}" -e GLIBC_COMPATIBILITY -e CC -e CXX -b ${DEBUILD_NOSIGN_OPTIONS} ${DEBUILD_NODEPS_OPTIONS}
 
 if [[ $STANDALONE != 'yes' ]]
 then