db: Fix checking for thread local storage with clang

This fixes the pthread_getspecific and pthread_setspecific calls in tls.m4.
Also append pthread library in global LDFLAGS variable.

mingw-w64-db/0001-db-tls-m4-fix-pthread.patch

@@ -0,0 +1,15 @@
+--- a/dist/aclocal/tls.m4
++++ b/dist/aclocal/tls.m4
+@@ -42,10 +42,10 @@
+              pthread_key_create(&key, NULL);
+          }
+          static void *get_tls() {
+-             return (void *)pthread_getspecific(&key);
++             return (void *)pthread_getspecific(key);
+          }
+          static void set_tls(void *p) {
+-              pthread_setspecific(&key, p);
++              pthread_setspecific(key, p);
+          }], [],
+          [ac_cv_tls=pthread])
+   fi

mingw-w64-db/PKGBUILD

@@ -17,19 +17,32 @@ depends=("${MINGW_PACKAGE_PREFIX}-gcc-libs"
 makedepends=("${MINGW_PACKAGE_PREFIX}-autotools"
              "${MINGW_PACKAGE_PREFIX}-cc")
 source=(https://download.oracle.com/berkeley-db/db-${pkgver}.tar.gz
+        0001-db-tls-m4-fix-pthread.patch
         mingw.patch
         clang_cxx_11.patch
         clang_libc++_store.patch)
 sha256sums=('2917c28f60903908c2ca4587ded1363b812c4e830a5326aaa77c9879d13ae18e'
+            '3b340bfa4817b5cbe1bf295e0cbb87d5a6e16384a16fff485f1e1991e15b1ce0'
             '62981c4064efccbe4219406316151a5266258c270b621f3b3faff39108978d02'
             'd7bc0d56fc20f7e71dca5b4bee21ef296cb6cd4d835ff9789dc61c11f3977325'
             '69be5d13b1377a0bebe767789afc1e9ab34fd6c15c5adcaeec2d5953508ae260')
 
+_apply_patch_with_msg() {
+  for _patch in "$@"
+  do
+    msg2 "Applying ${_patch}"
+    patch -p1 -i "${srcdir}/${_patch}"
+  done
+}
+
 prepare() {
   cd ${srcdir}/${_realname}-${pkgver}
-  patch -Nbp1 -i ${srcdir}/mingw.patch
-  patch -Nbp1 -i ${srcdir}/clang_cxx_11.patch
-  patch -Nbp1 -i ${srcdir}/clang_libc++_store.patch
+
+  _apply_patch_with_msg \
+    0001-db-tls-m4-fix-pthread.patch \
+    mingw.patch \
+    clang_cxx_11.patch \
+    clang_libc++_store.patch \
 
   pushd dist
   autoreconf -fiv -I aclocal -I aclocal_java
@@ -44,6 +57,7 @@ build() {
 
   CFLAGS+=" -DUNICODE -D_UNICODE"
   CXXFLAGS+=" -DUNICODE -D_UNICODE"
+  LDFLAGS+=" -lpthread"
 
   # for ucrt
   export ac_cv_func_time=yes