common: Define the missing crypto_compat_version version.

[orbea]

This fixes the build with slibtool (https://git.foss21.org/slibtool) which is an alternative implementation for GNU libtool.

rdlibtool  --tag=CC   --mode=link clang  -Wall -W -g -O2 -version-info  -no-undefined  -o libcrypto_compat.la  crypto-compat.lo  -lresolv 
rdlibtool: error: option [--version-info] requires a value 
make[2]: *** [Makefile:481: libcrypto_compat.la] Error 2
make[2]: Leaving directory '/tmp/cyrus-sasl/common'
make[1]: *** [Makefile:677: all-recursive] Error 1
make[1]: Leaving directory '/tmp/cyrus-sasl'
make: *** [Makefile:545: all] Error 2

The GNU libtool documentation for -version-info says:

This flag accepts an argument of the form ‘current[:revision[:age]]’. So, passing -version-info 3:12:1 sets current to 3, revision to 12, and age to 1.

If either revision or age are omitted, they default to 0. Also note that age must be less than or equal to the current interface number.

https://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html

Both the syntax of current[:revision[:age]] and only defining anything for when revision or age is missing indicates that at least current is required. However GNU libtool is happy to silently ignore this error while slibtool prints an error.

rdlibtool: error: option [--version-info] requires a value 

If another version value other than 0:0:0 is desired I can change that.

[orbea]

Please see this downstream issue: https://bugs.gentoo.org/775875

The fix is already applied in gentoo.

[quanah]

Please update your commit(s) to be signed off on in accordance with our DCO. Thanks!

[orbea]

Please update your commit(s) to be signed off on in accordance with our DCO.

Should be done.