don't scan subpathes of /usr/include for include files

ChangeLog

@@ -1,3 +1,8 @@
+2015-06-18 14:34  marc
+
+	* ChangeLog, configure.ac: build fails with GNU TLS, because pcsc.h
+	  there is something completely different
+
 2015-05-22 08:45  marc
 
 	* configure.ac: fixed package name for mac ports

ax_init_standard_project.m4

@@ -382,7 +382,7 @@ AC_DEFUN([AX_PKG_REQUIRE], [
         fi
       done
       if test ${$1_found} -eq 0 -a -n "$3"; then
-        for p in "/usr/include" ${$1_CFLAGS}; do
+        for p in ${$1_CFLAGS}; do
           AC_MSG_NOTICE([checking: [${p}] with [${p#-I}]])
           $1_file=$(find ${p#-I} -name $(echo "$3" | sed 's,.*/,,') | grep "$3" | head -1)
           AC_MSG_NOTICE([call: $1_file=[\$](find [$]{p[#]-I} -name "$3")])
@@ -417,7 +417,7 @@ AC_DEFUN([AX_PKG_REQUIRE], [
               fi
             done
             if test ${$1_found} -eq 0; then
-              for p in /usr/include ${$1_CFLAGS}; do
+              for p in ${$1_CFLAGS}; do
                 $1_file=$(find ${p#-I} -name $(echo "$3" | sed 's,.*/,,') | grep "$3" | head -1)
                 if test -e ${$1_file}; then
 		  AC_MSG_NOTICE([Header file $3 found in sub path of ${pkg} as ${$1_file}])