mingw-w64-gc: update libgc to version 7.6.0 (#2597)

mingw-w64-gc/0001-winpthreads.mingw.patch

@@ -1,11 +0,0 @@
---- gc-7.2/include/private/gc_locks.h.orig	2013-04-10 07:18:36 +0400
-+++ gc-7.2/include/private/gc_locks.h	2013-04-10 07:24:13 +0400
-@@ -98,7 +98,7 @@
-      /* integers for each thread, though that should be true as much    */
-      /* as possible.                                                    */
-      /* Refine to exclude platforms on which pthread_t is struct */
--#    if !defined(GC_WIN32_PTHREADS)
-+#    if !defined(GC_WIN32_PTHREADS) || defined(__WINPTHREADS_VERSION_MAJOR)
- #      define NUMERIC_THREAD_ID(id) ((unsigned long)(id))
- #      define THREAD_EQUAL(id1, id2) ((id1) == (id2))
- #      define NUMERIC_THREAD_ID_UNIQUE

mingw-w64-gc/PKGBUILD

@@ -3,8 +3,8 @@
 _realname=gc
 pkgbase=mingw-w64-${_realname}
 pkgname="${MINGW_PACKAGE_PREFIX}-${_realname}"
-pkgver=7.4.2
-pkgrel=2
+pkgver=7.6.0
+pkgrel=1
 pkgdesc="A garbage collector for C and C++ (mingw-w64)"
 arch=('any')
 url="http://www.hboehm.info/gc"
@@ -13,15 +13,12 @@ makedepends=(${MINGW_PACKAGE_PREFIX}-gcc ${MINGW_PACKAGE_PREFIX}-pkg-config)
 depends=(${MINGW_PACKAGE_PREFIX}-gcc-libs ${MINGW_PACKAGE_PREFIX}-libatomic_ops)
 options=('staticlibs' 'strip')
 source=("$url/gc_source/${_realname}-${pkgver}.tar.gz"
-        0001-winpthreads.mingw.patch
         0003-move-docs.all.patch)
-sha256sums=('63320ad7c45460e4a40e03f5aa4c6893783f21a16416c3282b994f933312afa2'
-            'e956bb9e5778570f7ebca78e91e1e6a23374cd0d67b32f8f224ff9070707835e'
+sha256sums=('a14a28b1129be90e55cd6f71127ffc5594e1091d5d54131528c24cd0c03b7d90'
             '0e65543cc83ddb2de86875635339eb9d0946fa7ad6d7492a544b2bf2075b8983')
 
 prepare() {
   cd "${srcdir}"/${_realname}-${pkgver}
-  patch -p1 -i ${srcdir}/0001-winpthreads.mingw.patch
   patch -p1 -i ${srcdir}/0003-move-docs.all.patch
 
   ./autogen.sh