Fix bootstrap macro

RHEL and CentOS Stream 8 don't seem to like the bootstrap macro name.
Use another name for it.

Related: RHBZ#2228550

dotnet8.0.spec

@@ -1,4 +1,4 @@
-%bcond_without bootstrap
+%bcond_without bootstrap_dotnet
 
 # LTO triggers a compilation error for a source level issue.  Given that LTO should not
 # change the validity of any given source and the nature of the error (undefined enum), I
@@ -60,7 +60,7 @@ License:        0BSD AND Apache-2.0 AND (Apache-2.0 WITH LLVM-exception) AND APS
 
 URL:            https://github.com/dotnet/
 
-%if %{with bootstrap}
+%if %{with bootstrap_dotnet}
 %global bootstrap_sdk_version 8.0.100-preview.6.23330.14
 %global tarball_name dotnet-%{upstream_tag}-x64-bootstrap
 # The source is generated on a Fedora box via:
@@ -103,7 +103,7 @@ ExclusiveArch:  x86_64
 BuildRequires:  clang
 BuildRequires:  cmake
 BuildRequires:  coreutils
-%if %{without bootstrap}
+%if %{without bootstrap_dotnet}
 BuildRequires:  dotnet-sdk-%{dotnetver}
 BuildRequires:  dotnet-sdk-%{dotnetver}-source-built-artifacts
 %endif
@@ -374,7 +374,7 @@ if [[ ${release_json_tag} != %{upstream_tag} ]]; then
    exit 1
 fi
 
-%if %{without bootstrap}
+%if %{without bootstrap_dotnet}
 %setup -q -n dotnet-%{upstream_tag}
 
 # Remove all prebuilts
@@ -448,7 +448,7 @@ sed -i -E 's|( /p:BuildDebPackage=false)|\1 --cmakeargs -DCLR_CMAKE_USE_SYSTEM_L
 %build
 cat /etc/os-release
 
-%if %{without bootstrap}
+%if %{without bootstrap_dotnet}
 # We need to create a copy because we will mutate this
 cp -a %{_libdir}/dotnet previously-built-dotnet
 find previously-built-dotnet
@@ -502,7 +502,7 @@ export COMPlus_LTTng=0
 export OPENSSL_ENABLE_SHA1_SIGNATURES=1
 
 VERBOSE=1 ./build.sh \
-%if %{without bootstrap}
+%if %{without bootstrap_dotnet}
     --with-sdk previously-built-dotnet \
 %endif
 %ifarch %{mono_archs}