winpthreads: Silence MSVC copyright message

Signed-off-by: Antonin Décimo <antonin@tarides.com>
Signed-off-by: Martin Storsjö <martin@martin.st>

mingw-w64-libraries/winpthreads/Makefile.am

diff --git a/mingw-w64-libraries/winpthreads/Makefile.am b/mingw-w64-libraries/winpthreads/Makefile.am
index 8a3b758..3d0da13 100644
--- a/mingw-w64-libraries/winpthreads/Makefile.am
+++ b/mingw-w64-libraries/winpthreads/Makefile.am
@@ -15,6 +15,10 @@
   src/barrier.c  src/cond.c  src/misc.c  src/mutex.c  src/rwlock.c  src/spinlock.c  src/thread.c  src/ref.c  src/sem.c  src/sched.c \
   src/winpthread_internal.h  src/clock.c src/nanosleep.c src/version.rc
 
+if MSVC
+AM_CFLAGS += -nologo
+endif
+
 # Break circular dep on bootstrap
 noinst_LIBRARIES = fakelib/libgcc.a  fakelib/libgcc_eh.a  fakelib/libgcc_s.a
 fakelib_libgcc_a_SOURCES = src/libgcc/dll_dependency.S src/libgcc/dll_math.c

mingw-w64-libraries/winpthreads/configure.ac

diff --git a/mingw-w64-libraries/winpthreads/configure.ac b/mingw-w64-libraries/winpthreads/configure.ac
index b691ad0..47be2d6 100644
--- a/mingw-w64-libraries/winpthreads/configure.ac
+++ b/mingw-w64-libraries/winpthreads/configure.ac
@@ -21,8 +21,11 @@
 
 AS_CASE([$CC],
   [*cl|*cl.exe],
-    [RC="$am_aux_dir/windres-rc rc.exe"]])
+    [RC="$am_aux_dir/windres-rc rc.exe"
+     msvc=true],
+  [msvc=false]])
 AC_SUBST([RCFLAGS])
+AM_CONDITIONAL([MSVC], [test x$msvc = xtrue])
 
 # Libtool 2.4 should check them correctly
 # AC_CHECK_TOOLS([AR],[ar],[:])