remove patch spkg

every system we support has a decent enough version of patch.
So we just purge it, like we did with tar a while ago.

Author: dimpase

README.md

@@ -217,7 +217,7 @@ in the Installation Guide.
       for a discussion of suitable compilers.
 
     - Build tools: GNU `make`, GNU `m4`, `perl` (including
-      `ExtUtils::MakeMaker`), `ranlib`, `git`, `tar`, `bc`.
+      `ExtUtils::MakeMaker`), `ranlib`, `git`, `tar`, `bc`, `patch`.
       See [build/pkgs/_prereq/SPKG.rst](build/pkgs/_prereq/SPKG.rst) for
       more details.
 

build/bin/sage-apply-patches

@@ -31,7 +31,7 @@ patchdir="../patches"
 patch_subdir=""
 patch_strip="-p1"
 patch_args_sep=""
-patch_args="--no-backup-if-mismatch"
+patch_args=""
 
 while [[ $# > 0 ]]; do
     if [[ -z "$patch_args_sep" ]]; then

build/pkgs/_prereq/distros/alpine.txt

@@ -18,3 +18,4 @@ gcc
 g++
 ca-certificates
 coreutils
+patch

build/pkgs/_prereq/distros/arch.txt

@@ -17,3 +17,4 @@ bc
 gcc
 # Needed for 4ti2:
 which
+patch

build/pkgs/_prereq/distros/conda.txt

@@ -14,3 +14,4 @@ perl
 python
 tar
 bc
+patch

build/pkgs/_prereq/distros/debian.txt

@@ -26,3 +26,4 @@ gcc
 g++
 # Needed if we download some packages from a https upstream URL
 ca-certificates
+patch

build/pkgs/_prereq/distros/fedora.txt

@@ -31,3 +31,4 @@ diffutils
 perl-IPC-Cmd
 # Needed to build gcc
 flex
+patch

build/pkgs/_prereq/distros/freebsd.txt

@@ -16,3 +16,4 @@ automake
 bash
 dash
 python # python metaport for bootstrapping the build
+patch

build/pkgs/_prereq/distros/gentoo.txt

@@ -27,3 +27,4 @@ dev-libs/libxml2
 sys-apps/findutils
 sys-apps/which
 sys-apps/diffutils
+sys-devel/patch

build/pkgs/_prereq/distros/nix.txt

@@ -16,3 +16,4 @@ gnutar
 bc
 gcc
 bash
+gnupatch