configure.ac: switch default ESAPI crypto backend to openSSL

Switch the default ESAPI crypto backend to openSSL.
This should also fix the problem with forcing applications to
link against libgcrypt.

Fixes: #1169

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>

diff --git a/configure.ac b/configure.ac
index c42b487..993e858 100644
--- a/configure.ac
+++ b/configure.ac

@@ -77,9 +77,9 @@
 
 AC_ARG_WITH([crypto],
             [AS_HELP_STRING([--with-crypto={gcrypt,ossl}],
-                            [sets the ESAPI crypto backend (default is gcrypt)])],
+                            [sets the ESAPI crypto backend (default is OpenSSL)])],
             [],
-            [with_crypto=gcrypt])
+            [with_crypto=ossl])
 
 AM_CONDITIONAL(ESYS_OSSL, test "x$with_crypto" = "xossl")
 AM_CONDITIONAL(ESYS_GCRYPT, test "x$with_crypto" = "xgcrypt")
@@ -311,4 +311,5 @@
     maxloglevel:        $with_maxloglevel
     doxygen:            $DX_FLAG_doc $enable_doxygen_doc
     tcti-device-async:  $enable_tcti_device_async
+    crypto backend:     $with_crypto
 ])

diff --git a/lib/tss2-esys.pc.in b/lib/tss2-esys.pc.in
index 792f019..ecb01bc 100644
--- a/lib/tss2-esys.pc.in
+++ b/lib/tss2-esys.pc.in

@@ -4,4 +4,4 @@
 Version: @VERSION@
 Requires: tss2-mu tss2-sys
 Cflags: -I@includedir@
-Libs: -ltss2-esys -lgcrypt -L@libdir@
+Libs: -ltss2-esys -L@libdir@