Fix libgfortran shared library for NaCl.

libgfortran/configure

Index: libgfortran/configure
diff --git a/libgfortran/configure b/libgfortran/configure
index caa7e59fd9c40e90fb28ee868e96001bf98b6f82..076c24943311a1ec6fb022d5659ee0128abca663 100755
--- a/libgfortran/configure
+++ b/libgfortran/configure
@@ -9532,6 +9532,21 @@ linux*oldld* | linux*aout* | linux*coff*)
   dynamic_linker=no
   ;;
 
+nacl*)
+  version_type=linux
+  need_lib_prefix=no
+  need_version=no
+  library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+  soname_spec='${libname}${release}${shared_ext}$major'
+  shlibpath_var=LD_LIBRARY_PATH
+  shlibpath_overrides_runpath=no
+
+  # This implies no fast_install, which is unacceptable.
+  # Some rework will be needed to allow for fast_install
+  # before this can be enabled.
+  hardcode_into_libs=yes
+  ;;
+
 # This must be Linux ELF.
 linux* | k*bsd*-gnu | kopensolaris*-gnu)
   version_type=linux
@@ -13771,6 +13786,21 @@ linux*oldld* | linux*aout* | linux*coff*)
   dynamic_linker=no
   ;;
 
+nacl*)
+  version_type=linux
+  need_lib_prefix=no
+  need_version=no
+  library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+  soname_spec='${libname}${release}${shared_ext}$major'
+  shlibpath_var=LD_LIBRARY_PATH
+  shlibpath_overrides_runpath=no
+
+  # This implies no fast_install, which is unacceptable.
+  # Some rework will be needed to allow for fast_install
+  # before this can be enabled.
+  hardcode_into_libs=yes
+  ;;
+
 # This must be Linux ELF.
 linux* | k*bsd*-gnu | kopensolaris*-gnu)
   version_type=linux