While I have not tested the patch provided, the following ls(1) command on Sun Solaris 10 Update 8 and Oracle Solaris 10 Update 11, show that on (at least) X86 systems, there is no -lcrypt for 64-bit builds. So a patch is required on 64-bit builds, and possibly 32-bit builds if library variant (_d vs _i) consistency is required.

% ls -l /usr/lib/**/libcrypt* | sed -e 's/ 1 root .* 20.. //'

lrwxrwxrwx  /usr/lib/amd64/libcrypt_d.so -> ./libcrypt_d.so.1
-rwxr-xr-x  /usr/lib/amd64/libcrypt_d.so.1
lrwxrwxrwx  /usr/lib/amd64/libcrypt_i.so -> libcrypt_i.so.1
-rwxr-xr-x  /usr/lib/amd64/libcrypt_i.so.1
lrwxrwxrwx  /usr/lib/amd64/libcryptoutil.so -> libcryptoutil.so.1
-rwxr-xr-x  /usr/lib/amd64/libcryptoutil.so.1
lrwxrwxrwx  /usr/lib/libcrypt.so -> libcrypt_d.so
lrwxrwxrwx  /usr/lib/libcrypt.so.1 -> libcrypt_d.so.1
lrwxrwxrwx  /usr/lib/libcrypt_d.so -> ./libcrypt_d.so.1
-rwxr-xr-x  /usr/lib/libcrypt_d.so.1
lrwxrwxrwx  /usr/lib/libcrypt_i.so -> ./libcrypt_i.so.1
-rwxr-xr-x  /usr/lib/libcrypt_i.so.1
lrwxrwxrwx  /usr/lib/libcryptoutil.so -> ./libcryptoutil.so.1
-rwxr-xr-x  /usr/lib/libcryptoutil.so.1

PS: Solaris 11.2 (X86) on the other hand does have a -lcrypt for both 32-bit and 64-bit libraries (libcrypt.so -> ./libcrypt.so.1)