gdb: update to 8.1.

Closes: #11284 [via git-merge-pr]

srcpkgs/gdb/template

@@ -1,6 +1,6 @@
 # Template file for 'gdb'
 pkgname=gdb
-version=8.0.1
+version=8.1
 revision=1
 patch_args="-Np1"
 build_style=gnu-configure
@@ -15,10 +15,7 @@ maintainer="Juan RP <xtraeme@voidlinux.eu>"
 homepage="http://www.gnu.org/software/gdb/"
 license="GPL-3"
 distfiles="${GNU_SITE}/$pkgname/$pkgname-$version.tar.xz"
-checksum=3dbd5f93e36ba2815ad0efab030dcd0c7b211d7b353a40a53f4c02d7d56295e3
-
-CFLAGS="-D_GLIBCXX_USE_C99_STDIO=1"
-CXXFLAGS="$CFLAGS"
+checksum=af61a0263858e69c5dce51eab26662ff3d2ad9aa68da9583e8143b5426be4b34
 
 if [ "${CROSS_BUILD}" ]; then
 	# Make python2.7 detection work in cross builds
@@ -41,6 +38,8 @@ pre_configure() {
 }
 pre_build() {
 	export gl_cv_func_gettimeofday_clobber=no
+	export gl_cv_func_working_strerror=yes
+	export gl_cv_func_strerror_0_works=yes
 }
 post_install() {
 	# resolve conflicts with binutils