gdb: build for cygwin

gdb/PKGBUILD

@@ -4,7 +4,7 @@ pkgname=gdb
 pkgname=("gdb"
          "gdb-multiarch")
 pkgver=14.2
-pkgrel=6
+pkgrel=7
 pkgdesc="GNU Debugger (MSYS2 version)"
 arch=('i686' 'x86_64')
 license=('spdx:GPL-3.0-or-later')
@@ -47,8 +47,8 @@ sha256sums=('2d4dd8061d8ded12b6c63f55e45344881e8226105f4d2a9b234040efa5ce7772'
             '15c7397d85b4f43ac22d5e81565de0d8d0a0b6473db2ab9a04fbb72f061fbf4e'
             '06f96b9a455344d1cc85b202fb65450fe3097005d39a680cc7945a8178ea9976'
             '268c35db936435f1d38c318956fffec14fd90f2bba085537cd5a44183f05a469'
-            '87a9ffcdc3d0c549efb390c7e59e86e9059ae29946fadcb269ee8b7578293483'
-            '5d462b9077543d2728c45b53e470b782a9ec45bf1743fc5ac7d7c4fca1d85668')
+            '51f531d06d864b76e1f3f811604e23628718b4fe827f9a59da0fc00a524c6215'
+            '66e0c1c6c6878b39da16c163d84b1ea303b0875b3ca6ccfef6d64872ecac9faa')
 
 prepare() {
   cd ${srcdir}/${pkgname}-${pkgver}
@@ -70,9 +70,10 @@ do_build() {
   [[ -d "$builddir" ]] && rm -rf "$builddir"
   mkdir -p "$builddir" && pushd "$builddir"
 
+  export MSYSTEM=CYGWIN
+  local CYGWIN_CHOST="${CHOST/-msys/-cygwin}"
   ../${pkgname}-${pkgver}/configure \
-    --build=${CHOST} \
-    --host=${CHOST} \
+    --build=${CYGWIN_CHOST} \
     --prefix=/usr \
     $2 \
     --enable-64-bit-bfd \