`pkg-config gnutls --variable=crypto_lib`

[Arfrever Frehtes Taifersar Arahesis]

The attached patch adds support for `pkg-config gnutls --variable=crypto_lib`
so that users of GnuTLS can check crypto library used by GnuTLS.
It might be useful for build systems of packages, which use GnuTLS.

$ pkg-config gnutls --variable=crypto_lib
nettle

-- 
Arfrever Frehtes Taifersar Arahesis

--- lib/gnutls.pc.in
+++ lib/gnutls.pc.in
@@ -14,6 +14,7 @@
 address@hidden@
 address@hidden@
 address@hidden@
address@hidden@
 
 Name: GnuTLS
 Description: Transport Security Layer implementation for the GNU system
--- lib/m4/hooks.m4
+++ lib/m4/hooks.m4
@@ -59,6 +59,8 @@
       fi
     fi
 
+  AC_SUBST(CRYPTO_LIB, $cryptolib)
+
   AC_MSG_CHECKING([whether to use nettle])
 if test "$cryptolib" = "nettle";then
   AC_MSG_RESULT(yes)

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