build/luarocks: avoid parallelism for luarocks build

Is there a race between the luarocks `make bootstrap` dependencies?

reverts f73b4911312b35bfe38ed068672a2f8ba8875ba7
ref https://github.com/luarocks/luarocks/pull/774

third-party/CMakeLists.txt

@@ -50,9 +50,11 @@ endif()
 
 option(USE_EXISTING_SRC_DIR "Skip download of deps sources in case of existing source directory." OFF)
 
-find_package(Git)
-if(NOT Git_FOUND)
-  message(FATAL_ERROR "Git is required to apply patches to bundled dependencies")
+if(WIN32)
+  find_package(Git)
+  if(NOT Git_FOUND)
+    message(FATAL_ERROR "Git is required to apply patches for Windows.")
+  endif()
 endif()
 
 if(UNIX)

third-party/cmake/BuildLuarocks.cmake

@@ -70,13 +70,9 @@ if(UNIX OR (MINGW AND CMAKE_CROSSCOMPILING))
   endif()
 
   BuildLuarocks(
-    PATCH_COMMAND
-      ${GIT_EXECUTABLE} -C ${DEPS_BUILD_DIR}/src/luarocks init
-      COMMAND ${GIT_EXECUTABLE} -C ${DEPS_BUILD_DIR}/src/luarocks apply
-      ${CMAKE_CURRENT_SOURCE_DIR}/patches/luarocks-Fix-siteconfig.patch
     CONFIGURE_COMMAND ${DEPS_BUILD_DIR}/src/luarocks/configure
       --prefix=${HOSTDEPS_INSTALL_DIR} --force-config ${LUAROCKS_OPTS}
-    INSTALL_COMMAND ${MAKE_PRG} bootstrap)
+    INSTALL_COMMAND ${MAKE_PRG} -j1 bootstrap)
 elseif(MSVC OR MINGW)
 
   if(MINGW)

third-party/patches/luarocks-Fix-siteconfig.patch

@@ -1,28 +0,0 @@
-From dad6687372b1568f1543388d5014190a076e388a Mon Sep 17 00:00:00 2001
-Date: Thu, 8 Mar 2018 22:50:52 +0100
-Subject: [PATCH] Fix site_config
-
----
- src/luarocks/cfg.lua | 4 ++--
- 1 file changed, 2 insertions(+), 2 deletions(-)
-
-diff --git a/src/luarocks/cfg.lua b/src/luarocks/cfg.lua
-index 1d5c9872e205..aa34a4f9748b 100644
---- a/src/luarocks/cfg.lua
-+++ b/src/luarocks/cfg.lua
-@@ -23,10 +23,10 @@ local version_suffix = cfg.lua_version:gsub("%.", "_")
- 
- -- Load site-local global configurations
- local ok, site_config = pcall(require, "luarocks.site_config_"..version_suffix)
--if not ok then
-+if not ok or type(site_config) ~= "table" then
-    ok, site_config = pcall(require, "luarocks.site_config")
- end
--if not ok then
-+if not ok or type(site_config) ~= "table" then
-    io.stderr:write("Site-local luarocks/site_config.lua file not found. Incomplete installation?\n")
-    site_config = {}
- end
--- 
-2.7.4
-