Isolation: fixed the generation of mounts table.

Since the introduction of rootfs feature, some language modules
can't be configured multiple times.

Now the configure generates a separate nxt_<module>_mounts.h for
each module compiled.

src/nxt_java.c

@@ -26,7 +26,8 @@
 #include "java/nxt_jni_URLClassLoader.h"
 
 #include "nxt_jars.h"
-#include "nxt_java_mounts.h"
+
+#include NXT_JAVA_MOUNTS_H
 
 static nxt_int_t nxt_java_setup(nxt_task_t *task, nxt_process_t *process,
     nxt_common_app_conf_t *conf);

src/nxt_python_wsgi.c

@@ -18,7 +18,8 @@
 #include <nxt_unit_field.h>
 #include <nxt_unit_request.h>
 #include <nxt_unit_response.h>
-#include <nxt_python_mounts.h>
+
+#include NXT_PYTHON_MOUNTS_H
 
 /*
  * According to "PEP 3333 / A Note On String Types"
@@ -39,11 +40,6 @@
  */
 
 
-#define _NXT_PYTHON_MOUNTS(major, minor)                                      \
-    nxt_python ## major ## minor ## _mounts
-
-#define NXT_PYTHON_MOUNTS(major, minor) _NXT_PYTHON_MOUNTS(major, minor)
-
 #if PY_MAJOR_VERSION == 3
 #define NXT_PYTHON_BYTES_TYPE       "bytestring"
 
@@ -123,8 +119,8 @@ NXT_EXPORT nxt_app_module_t  nxt_app_module = {
     compat,
     nxt_string("python"),
     PY_VERSION,
-    NXT_PYTHON_MOUNTS(PY_MAJOR_VERSION, PY_MINOR_VERSION),
-    nxt_nitems(NXT_PYTHON_MOUNTS(PY_MAJOR_VERSION, PY_MINOR_VERSION)),
+    nxt_python_mounts,
+    nxt_nitems(nxt_python_mounts),
     NULL,
     nxt_python_start,
 };

src/ruby/nxt_ruby.c

@@ -7,7 +7,8 @@
 
 #include <nxt_unit.h>
 #include <nxt_unit_request.h>
-#include <nxt_ruby_mounts.h>
+
+#include NXT_RUBY_MOUNTS_H
 
 
 #define NXT_RUBY_RACK_API_VERSION_MAJOR  1