pcsc-relay: include thread locking mechanism

fixes regression from 0aec0e4

closes #5

pcsc-relay/configure.ac

@@ -25,6 +25,7 @@ AM_PROG_CC_C_O
 AM_PATH_PYTHON
 AC_PROG_SED
 PKG_PROG_PKG_CONFIG
+AX_PTHREAD
 AC_ARG_VAR([HELP2MAN],
            [absolute path to help2man used for man page generation of pcsc-relay])
 AC_PATH_PROG(HELP2MAN, help2man, not found)
@@ -115,6 +116,8 @@ Compiler flags:       ${CFLAGS}
 Preprocessor flags:   ${CPPFLAGS}
 Linker flags:         ${LDFLAGS}
 Libraries:            ${LIBS}
+PTHREAD_LIBS:         ${PTHREAD_LIBS}
+PTHREAD_CFLAGS:       ${PTHREAD_CFLAGS}
 PCSC_CFLAGS:          ${PCSC_CFLAGS}
 PCSC_LIBS:            ${PCSC_LIBS}
 LIBNFC_CFLAGS:        ${LIBNFC_CFLAGS}