autoconfigure crypt_r(): uclibc has no crypt_r()

auto/os/linux

diff --git a/auto/os/linux b/auto/os/linux
index 43ff3c9..c19f3f4 100644
--- a/auto/os/linux
+++ b/auto/os/linux
@@ -124,6 +124,19 @@
 . auto/feature
 
 
+# crypt_r()
+
+ngx_feature="crypt_r()"
+ngx_feature_name="NGX_HAVE_GNU_CRYPT_R"
+ngx_feature_run=no
+ngx_feature_incs="#include <crypt.h>"
+ngx_feature_path=
+ngx_feature_libs=-lcrypt
+ngx_feature_test="struct crypt_data  cd;
+                  crypt_r(NULL, NULL, &cd);"
+. auto/feature
+
+
 ngx_include="sys/vfs.h";     . auto/include
 
 

src/os/unix/ngx_linux_config.h

diff --git a/src/os/unix/ngx_linux_config.h b/src/os/unix/ngx_linux_config.h
index abeda08..fb978c4 100644
--- a/src/os/unix/ngx_linux_config.h
+++ b/src/os/unix/ngx_linux_config.h
@@ -95,11 +95,6 @@
 #endif
 
 
-#ifndef NGX_HAVE_GNU_CRYPT_R
-#define NGX_HAVE_GNU_CRYPT_R         1
-#endif
-
-
 #ifndef NGX_HAVE_INHERITED_NONBLOCK
 #define NGX_HAVE_INHERITED_NONBLOCK  0
 #endif