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configure: Use both check_header and check_lib for pthreads

check_lib can be a stub that always returns true - make sure to
still use check_headers as before 38dc27cc6.

Change-Id: I5d471de56b16c015a0b686fa6c6caefa35bb89b4

--- a/build/make/configure.sh

+++ b/build/make/configure.sh

@@ -1491,7 +1491,7 @@

         # bionic includes basic pthread functionality, obviating -lpthread.

         ;;

       *)

-        check_lib -lpthread <<EOF && enable_feature pthread_h && add_extralibs -lpthread

+        check_header pthread.h && check_lib -lpthread <<EOF && enable_feature pthread_h && add_extralibs -lpthread

 #include <pthread.h>

 #include <stddef.h>

 int main(void) { return pthread_create(NULL, NULL, NULL, NULL); }

--- a/configure

+++ b/configure

@@ -582,7 +582,10 @@

 int main(void) {return 0;}

 EOF

     # check system headers

-    check_lib -lpthread <<EOF && enable_feature pthread_h

+

+    # Use both check_header and check_lib here, since check_lib

+    # could be a stub that always returns true.

+    check_header pthread.h && check_lib -lpthread <<EOF && enable_feature pthread_h

 #include <pthread.h>

 #include <stddef.h>

 int main(void) { return pthread_create(NULL, NULL, NULL, NULL); }