Allows modification of how `./xbps-src` resolves the versions of dependencies

xbps-src-force-python3-repover.patch

This change allows you to you to modify how `./xbps-src` resolves the
versions of dependencies.

For all packages listed in `etc/repover`, xbps-src will use the binary
repository version when resolved as a depdencency, even if the srcpkg
version is greater. The pkgs must be listed one per line, and without the
version number.

**NOTE**: The use-case for this is pretty niche. You probably don't
want to do this. The author's use-case for this was that they wanted to
build their own python module, but the current srcpkg version of Python
was greater than the repo version, so the resulting binpkg was unusable
on their system.

diff --git a/etc/repover b/etc/repover
new file mode 100644
index 00000000000..4277280d6b6
--- a/etc/repover
+++ b/etc/repover
@@ -0,0 +1,9 @@
+python3
+python3-build
+python3-devel
+python3-filt_core
+python3-installer
+python3-packaging
+python3-parsing
+python3-setuptools
+python3-wheel

diff --git a/common/xbps-src/shutils/build_dependencies.sh b/common/xbps-src/shutils/build_dependencies.sh
index 0815e776726..8c612ff5310 100644
--- a/common/xbps-src/shutils/build_dependencies.sh
+++ b/common/xbps-src/shutils/build_dependencies.sh
@@ -1,5 +1,11 @@
 # vim: set ts=4 sw=4 et:
 #
+checkver_override() {
+    local pkg="$1"
+    [ -r "${XBPS_DISTDIR}/etc/repover" ] && \
+        grep -E "^${pkg}\b" "${XBPS_DISTDIR}/etc/repover" >/dev/null
+}
+
 setup_pkg_depends() {
     local pkg="$1" out="$2" with_subpkgs="$3" j _rpkgname _depname _pkgname foo _deps collected
 
@@ -186,6 +192,11 @@ install_pkg_deps() {
             msg_error "$pkgver: host dependency '$f' does not exist!\n"
         done
         while read -r _depname _deprepover _depver _subpkg _repourl; do
+            if checkver_override ${_subpkg}; then
+                echo "   [host] ${_subpkg}: using repover override version ${_deprepover}"
+                _depver=${_deprepover}
+            fi
+
             _vpkg=${_subpkg}-${_depver}
             # binary package found in a repo
             if [[ ${_depver} == ${_deprepover} ]]; then
@@ -236,6 +247,11 @@ install_pkg_deps() {
             msg_error "$pkgver: check dependency '$f' does not exist!\n"
         done
         while read -r _depname _deprepover _depver _subpkg _repourl; do
+            if checkver_override ${_subpkg}; then
+                echo "   [check] ${_subpkg}: using repover override version ${_deprepover}"
+                _depver=${_deprepover}
+            fi
+
             _vpkg=${_subpkg}-${_depver}
             # binary package found in a repo
             if [[ ${_depver} == ${_deprepover} ]]; then
@@ -286,6 +302,11 @@ install_pkg_deps() {
             msg_error "$pkgver: target dependency '$f' does not exist!\n"
         done
         while read -r _depname _deprepover _depver _subpkg _repourl; do
+            if checkver_override ${_subpkg}; then
+                echo "   [target] ${_subpkg}: using repover override version ${_deprepover}"
+                _depver=${_deprepover}
+            fi
+
             _vpkg=${_subpkg}-${_depver}
             # binary package found in a repo
             if [[ ${_depver} == ${_deprepover} ]]; then
@@ -335,6 +356,11 @@ install_pkg_deps() {
             msg_error "$pkgver: target dependency '$f' does not exist!\n"
         done
         while read -r _depname _deprepover _depver _subpkg _repourl; do
+            if checkver_override ${_subpkg}; then
+                echo "   [runtime] ${_subpkg}: using repover override version ${_deprepover}"
+                _depver=${_deprepover}
+            fi
+
             _vpkg=${_subpkg}-${_depver}
             # binary package found in a repo
             if [[ ${_depver} == ${_deprepover} ]]; then

diff --git a/.gitignore b/.gitignore
index e91ff787554..5b0fca8ce08 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,3 +23,4 @@ etc/conf.*
 etc/virtual
 etc/xbps.d/custom
 etc/repo-keys
+etc/repover