remove deprecated cmake flag from compat workflow

Author: bratpiorka

.github/workflows/reusable_compatibility.yml

@@ -97,7 +97,6 @@ jobs:
         -DUMF_FORMAT_CODE_STYLE=OFF
         -DUMF_DEVELOPER_MODE=ON
         -DUMF_BUILD_LIBUMF_POOL_JEMALLOC=ON
-        -DUMF_BUILD_LIBUMF_POOL_DISJOINT=ON
         -DUMF_TESTS_FAIL_ON_SKIP=ON
 
     - name: Build latest UMF
@@ -197,7 +196,6 @@ jobs:
         -DUMF_FORMAT_CODE_STYLE=OFF
         -DUMF_DEVELOPER_MODE=ON
         -DUMF_BUILD_LIBUMF_POOL_JEMALLOC=ON
-        -DUMF_BUILD_LIBUMF_POOL_DISJOINT=ON
         -DUMF_TESTS_FAIL_ON_SKIP=ON
 
     - name: Build latest UMF