Merge remote-tracking branch 'qatar/master'

* qatar/master:
  configure: Support preprocessor macros as header names

Merged-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -845,6 +845,13 @@ check_ld(){
     check_cmd $ld $LDFLAGS $flags $(ld_o $TMPE) $TMPO $libs $extralibs
 }
 
+print_include(){
+    hdr=$1
+    test "${hdr%.h}" = "${hdr}" &&
+        echo "#include $hdr"    ||
+        echo "#include <$hdr>"
+}
+
 check_code(){
     log check_code "$@"
     check=$1
@@ -853,7 +860,7 @@ check_code(){
     shift 3
     {
         for hdr in $headers; do
-            echo "#include <$hdr>"
+            print_include $hdr
         done
         echo "int main(void) { $code; return 0; }"
     } | check_$check "$@"
@@ -956,7 +963,7 @@ check_func_headers(){
     shift 2
     {
         for hdr in $headers; do
-            echo "#include <$hdr>"
+            print_include $hdr
         done
         for func in $funcs; do
             echo "long check_$func(void) { return (long) $func; }"