Revert "Reenable flint compilation for most modules"

This reverts commit 424cc74.

src/meson.build

@@ -66,11 +66,17 @@ pari = cc.find_library('pari', required: not is_windows, disabler: true)
 
 mpfr = dependency('mpfr')
 
+if is_windows
+  # Flint on conda currently actives FLINT_USES_PTHREAD, which is not available under msvc
+  # https://github.com/conda-forge/libflint-feedstock/issues/38
+  flint = disabler()
+else
   flint = dependency('flint', version: '>=3.0.0')
   if flint.version().version_compare('<3.1')
     # In older versions of flint, pkg-config file is broken, so we manually use find_library
     # This has been fixed in flint v3.1: https://github.com/flintlib/flint/pull/1647
     flint = cc.find_library('flint')
+  endif
 endif
 
 blas_order = []

src/sage/rings/meson.build

@@ -135,7 +135,7 @@ foreach name, pyx : extension_data
   elif name == 'complex_interval'
     deps += [
       mpfi,
-      flint,
+      flint,  # Runtime dependency
     ]
   elif name == 'complex_mpc'
     deps += [gmpy2, mpfr, mpc]

src/sage/rings/polynomial/meson.build

@@ -102,13 +102,9 @@ foreach name, pyx : extension_data
   elif name == 'polynomial_real_mpfr_dense'
     deps += [mpfr]
   elif name == 'real_roots'
-    deps += [flint, mpfi]
-    if is_windows
-      # Compilation error: include\flint\fmpz_mpoly.h(975): error C2143: syntax error: missing ')' before 'constant'
-      continue
-    endif
+    deps += [mpfi]
   elif name == 'hilbert'
-    deps += [flint, mpfi]
+    deps += [mpfi]
   endif
 
   py.extension_module(