qmake MSYS2 disabled LLD linker override for g++

LLD isn't faster than bfd, I also did linking when bfd was faster than
LLD.

 - also updated docs

[skip ci]

Author: silverqx

Diff for: .env.mingw.example

@@ -3,7 +3,7 @@
 
 # Use alternative linker (for both GCC and Clang)
 # CONFIG *= use_lld_linker does not work on MinGW
-QMAKE_LFLAGS *= -fuse-ld=lld
+#QMAKE_LFLAGS *= -fuse-ld=lld
 
 # vcpkg - range-v3 and tabulate
 TINY_VCPKG_ROOT = $$quote(C:/msys64/home/xyz/Code/vcpkg/)

Diff for: conf.pri.example

@@ -105,7 +105,7 @@ win32-g++|win32-clang-g++ {
 
     # Use alternative linker (for both GCC and Clang)
     # CONFIG *= use_lld_linker does not work on MinGW
-    QMAKE_LFLAGS *= -fuse-ld=lld
+#    QMAKE_LFLAGS *= -fuse-ld=lld
 
     # Nothing to do, auto-configuration is enabled
     !disable_autoconf: return()

Diff for: docs/building/hello-world.mdx

@@ -609,7 +609,7 @@ TINY_VCPKG_TRIPLET = x64-mingw-dynamic
 
 # Use alternative linker (for both GCC and Clang)
 # CONFIG *= use_lld_linker does not work on MinGW
-QMAKE_LFLAGS *= -fuse-ld=lld
+#QMAKE_LFLAGS *= -fuse-ld=lld
 ```
 
 </TabItem>

Diff for: docs/building/migrations.mdx

@@ -749,7 +749,7 @@ TINY_VCPKG_TRIPLET = x64-mingw-dynamic
 
 # Use alternative linker (for both GCC and Clang)
 # CONFIG *= use_lld_linker does not work on MinGW
-QMAKE_LFLAGS *= -fuse-ld=lld
+#QMAKE_LFLAGS *= -fuse-ld=lld
 ```
 
 </TabItem>

Diff for: drivers/conf.pri.example

@@ -13,7 +13,7 @@ win32-g++|win32-clang-g++ {
 
     # Use alternative linker (for both GCC and Clang)
     # CONFIG *= use_lld_linker does not work on MinGW
-    QMAKE_LFLAGS *= -fuse-ld=lld
+#    QMAKE_LFLAGS *= -fuse-ld=lld
 
     # Nothing to do, auto-configuration is enabled
     !disable_autoconf: return()

Diff for: examples/tom/conf.pri.example

@@ -26,7 +26,7 @@ win32-g++|win32-clang-g++ {
 
     # Use alternative linker (for both GCC and Clang)
     # CONFIG *= use_lld_linker does not work on MinGW
-    QMAKE_LFLAGS *= -fuse-ld=lld
+#    QMAKE_LFLAGS *= -fuse-ld=lld
 
     # Nothing to do, auto-configuration is enabled
     !disable_autoconf: return()

Diff for: tests/conf.pri.example

@@ -13,7 +13,7 @@ win32-g++|win32-clang-g++ {
 
     # Use alternative linker (for both GCC and Clang)
     # CONFIG *= use_lld_linker does not work on MinGW
-    QMAKE_LFLAGS *= -fuse-ld=lld
+#    QMAKE_LFLAGS *= -fuse-ld=lld
 
     # Nothing to do, auto-configuration is enabled
     !disable_autoconf: return()

Diff for: tests/testdata_tom/conf.pri.example

@@ -13,7 +13,7 @@ win32-g++|win32-clang-g++ {
 
     # Use alternative linker (for both GCC and Clang)
     # CONFIG *= use_lld_linker does not work on MinGW
-    QMAKE_LFLAGS *= -fuse-ld=lld
+#    QMAKE_LFLAGS *= -fuse-ld=lld
 
     # Nothing to do, auto-configuration is enabled
     !disable_autoconf: return()