Adds curl support to main core

Curl was used only by mlogc, as we want to expand ModSecurity to load
external rules/resources it is now a dependency of the core as well.

tests/Makefile.am

@@ -32,6 +32,7 @@ msc_test_SOURCES = msc_test.c \
 msc_test_CFLAGS = @APR_CFLAGS@ \
     @APU_CFLAGS@ \
     @APXS_CFLAGS@ \
+    @CURL_CFLAGS@ \
     @LIBXML2_CFLAGS@ \
     @LUA_CFLAGS@ \
     @MODSEC_EXTRA_CFLAGS@ \
@@ -41,11 +42,15 @@ msc_test_CFLAGS = @APR_CFLAGS@ \
     
 msc_test_CPPFLAGS = -I$(top_srcdir)/apache2 \
     @APR_CPPFLAGS@ \
+    @CURL_CPPFLAGS@ \
+    @LIBXML2_CFLAGS@ \
     @LIBXML2_CPPFLAGS@ \
     @PCRE_CPPFLAGS@
     
 msc_test_LDADD = @APR_LDADD@ \
     @APU_LDADD@ \
+    @CURL_LDADD@ \
+    @LIBXML2_CFLAGS@ \
     @LIBXML2_LDADD@ \
     @LUA_LDADD@ \
     @PCRE_LDADD@ \
@@ -55,6 +60,7 @@ msc_test_LDADD = @APR_LDADD@ \
 msc_test_LDFLAGS = @APR_LDFLAGS@ \
     @APU_LDFLAGS@ \
     @APXS_LDFLAGS@ \
+    @CURL_LDFLAGS@ \
     @LIBXML2_LDFLAGS@ \
     @LUA_LDFLAGS@ \
     @PCRE_LDFLAGS@ \