[boost-modular-build-helper] Fix x86 MinGW build (#27955)

ports/boost-modular-build-helper/CMakeLists.txt

@@ -48,11 +48,11 @@ else()
     list(APPEND B2_OPTIONS architecture=x86)
 endif()
 
-if(VCPKG_TARGET_ARCHITECTURE STREQUAL "x86" AND WIN32)
-    list(APPEND B2_OPTIONS "asmflags=/safeseh")
-endif()
-
 if(VCPKG_DETECTED_MSVC)
+    if(VCPKG_TARGET_ARCHITECTURE STREQUAL "x86")
+        list(APPEND B2_OPTIONS "asmflags=/safeseh")
+    endif()
+
     if(VCPKG_DETECTED_CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
         set(USER_CONFIG_TOOLSET clang-win)
     else()

ports/boost-modular-build-helper/vcpkg.json

@@ -2,7 +2,7 @@
   "$comment": "When changing this file also update and run scripts/boost/generate-ports.ps1",
   "name": "boost-modular-build-helper",
   "version": "1.80.0",
-  "port-version": 3,
+  "port-version": 4,
   "description": "Internal vcpkg port used to build Boost libraries",
   "license": "MIT",
   "dependencies": [

scripts/boost/generate-ports.ps1

@@ -99,7 +99,7 @@ $portVersions = @{
     "boost-logic" = 1;
     "boost-math" = 1;
     "boost-metaparse" = 1;
-    "boost-modular-build-helper" = 3;
+    "boost-modular-build-helper" = 4;
     "boost-move" = 1;
     "boost-mp11" = 1;
     "boost-mpi" = 1;

versions/b-/boost-modular-build-helper.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "0631e980f0a18e2175424e672b55709b84e19aa3",
+      "version": "1.80.0",
+      "port-version": 4
+    },
     {
       "git-tree": "4a8c162e2661795b998a8435b6ec7207608fe73a",
       "version": "1.80.0",

versions/baseline.json

@@ -862,7 +862,7 @@
     },
     "boost-modular-build-helper": {
       "baseline": "1.80.0",
-      "port-version": 3
+      "port-version": 4
     },
     "boost-move": {
       "baseline": "1.80.0",