Fixed 'Requires:' names.

The 'Requires:' line lists the names of the .pc files.

configure.ac

@@ -96,13 +96,13 @@ AC_ARG_WITH(libz,
 # Look for OpenSSL (default)
 if test "$use_openssl" != "no" && test "$use_libgcrypt" != "yes"; then
   AC_LIB_HAVE_LINKFLAGS([ssl], [crypto], [#include <openssl/ssl.h>])
-  LIBSREQUIRED=ssl,crypto
+  LIBSREQUIRED=libssl,libcrypto
 fi
 
 # Look for libgcrypt
 if test "$ac_cv_libssl" != "yes" && test "$use_libgcrypt" != "no"; then
   AC_LIB_HAVE_LINKFLAGS([gcrypt], [], [#include <gcrypt.h>])
-  LIBSREQUIRED=gcrypt
+  LIBSREQUIRED=libgcrypt
 fi
 
 AC_SUBST(LIBSREQUIRED)