Prepare for building tests.

Move main() out of radsecproxy.c.
Build a static library and link a main.c with it.

Makefile.am

@@ -2,8 +2,13 @@ AUTOMAKE_OPTIONS = foreign
 
 sbin_PROGRAMS = radsecproxy
 bin_PROGRAMS  = catgconf
+noinst_LIBRARIES = librsp.a
 
-radsecproxy_SOURCES = radsecproxy.c \
+radsecproxy_SOURCES = main.c
+
+nodist_librsp_a_SOURCES = $(radsecproxy_SOURCES)
+
+librsp_a_SOURCES = radsecproxy.c \
                       tlscommon.c \
                       gconfig.c \
                       util.c \
@@ -42,7 +47,7 @@ catgconf_SOURCES    = debug.c \
 radsecproxy_CFLAGS  = -g -Wall -Werror -fno-strict-aliasing \
 	@SSL_CFLAGS@ @TARGET_CFLAGS@
 radsecproxy_LDFLAGS = @SSL_LDFLAGS@ @TARGET_LDFLAGS@
-radsecproxy_LDADD   = @SSL_LIBS@
+radsecproxy_LDADD   = librsp.a @SSL_LIBS@
 
 catgconf_CFLAGS     = -g -Wall -fno-strict-aliasing @TARGET_CFLAGS@
 catgconf_LDFLAGS    = @TARGET_LDFLAGS@

configure.ac

@@ -3,6 +3,7 @@ AC_CANONICAL_TARGET
 AM_INIT_AUTOMAKE
 AC_PROG_CC
 AM_PROG_CC_C_O
+AC_PROG_RANLIB
 udp=yes
 AC_ARG_ENABLE(udp,
   [  --enable-udp whether to enable UDP transport: yes/no; default yes ],

main.c

@@ -0,0 +1,7 @@
+int radsecproxy_main(int argc, char **argv);
+
+int main(int argc, char **argv)
+{
+  return radsecproxy_main(argc, argv);
+}
+

radsecproxy.c

@@ -3195,7 +3195,7 @@ int createpidfile(const char *pidfile) {
     return f && !fclose(f) && r >= 0;
 }
 
-int main(int argc, char **argv) {
+int radsecproxy_main(int argc, char **argv) {
     pthread_t sigth;
     sigset_t sigset;
     struct list_node *entry;