Revert "occt: update to 7.5.0."

OCCT 7.5.0 breaks ABI, and downstream packages such as FreeCAD fail to
build.

Keep the license change. We should also stick with their repository
instead of GitHub, which doesn't have all the releases.

This reverts commit abe75dc062e4353618830b563b0ae0596d0606ad.

Closes: #29541 [via git-merge-pr]

srcpkgs/occt/patches/fix-cmake-regex.patch

@@ -3,7 +3,7 @@
 
 --- adm/templates/OpenCASCADEConfig.cmake.in	2019-01-27 00:18:42.763819658 -0500
 +++ adm/templates/OpenCASCADEConfig.cmake.in	2019-01-27 23:40:32.872489521 -0500
-@@ -27,7 +27,7 @@
+@@ -26,7 +26,7 @@
  if (OpenCASCADE_INSTALL_PREFIX MATCHES "/cmake$")
    get_filename_component (OpenCASCADE_INSTALL_PREFIX "${OpenCASCADE_INSTALL_PREFIX}" PATH)
  endif()

srcpkgs/occt/patches/musl-fenv.patch

@@ -11,8 +11,8 @@ non-posix functions fegetexcept(3) and feenableexcept(3).
  
  #include <signal.h>
  
--#if !defined(__ANDROID__) && !defined(__QNX__) && !defined(__EMSCRIPTEN__)
-+#if !defined(__ANDROID__) && !defined(__QNX__) && !defined(__EMSCRIPTEN__) && defined(__GLIBC__)
+-#if !defined(__ANDROID__) && !defined(__QNX__)
++#if !defined(__ANDROID__) && !defined(__QNX__) && defined(__GLIBC__)
    #include <sys/signal.h>
  #endif
  

srcpkgs/occt/patches/musl-mallinfo.patch

@@ -2,17 +2,16 @@ In musl libc there is no struct mallinfo and no function mallinf()
 
 --- src/OSD/OSD_MemInfo.cxx.orig
 +++ src/OSD/OSD_MemInfo.cxx
-
-@@ -182,8 +182,12 @@
- #elif (defined(__linux__) || defined(__linux))
-   if (IsActive (MemHeapUsage))
-   {
-+    #if defined(__GLIBC__)
-     const struct mallinfo aMI = mallinfo();
-     myCounters[MemHeapUsage] = aMI.uordblks;
-+    #else /* XXX not yet coded */
-+    myCounters[MemHeapUsage] = 0;
-+    #endif
+@@ -147,8 +147,12 @@
    }
+   aFile.close();
  
-   if (!IsActive (MemVirtual)
++  #if defined(__GLIBC__)
+   struct mallinfo aMI = mallinfo();
+   myCounters[MemHeapUsage] = aMI.uordblks;
++  #else /* XXX not yet coded */
++  myCounters[MemHeapUsage] = 0;
++  #endif
+ 
+ #elif (defined(__APPLE__))
+   struct task_basic_info aTaskInfo;

srcpkgs/occt/template

@@ -1,9 +1,10 @@
 # Template file for 'occt'
 pkgname=occt
-version=7.5.0
-revision=1
-_ver="${version//./_}"
-wrksrc=OCCT-${_ver}
+reverts=7.5.0_1
+version=7.4.0p1
+revision=3
+_gittag="V${version//./_}"
+wrksrc=occt-${_gittag}
 build_style=cmake
 configure_args="-DUSE_FREEIMAGE=ON -DUSE_TBB=ON -DUSE_GL2PS=ON -DUSE_VTK=OFF
  -DINSTALL_SAMPLES=ON"
@@ -13,8 +14,10 @@ short_desc="OpenCASCADE Technology - library for CAD/CAM/CAE applications"
 maintainer="Piraty <piraty1@inbox.ru>"
 license="custom:LGPL-2.1-only-with-exceptions"
 homepage="https://www.opencascade.com"
-distfiles="https://github.com/Open-Cascade-SAS/OCCT/archive/V${_ver}.tar.gz"
-checksum=dbe1d62a9317ad1516bd4575293d9aab2dc20206ca7a60a7705c9a3b77dc59c9
+# distfile: use git instead of official tarball, which requires registration
+# see https://www.opencascade.com/content/packaging-again-debian
+distfiles="https://git.dev.opencascade.org/gitweb/?p=occt.git;a=snapshot;h=refs/tags/${_gittag};sf=tgz>occt-${_gittag}.tar.gz"
+checksum=e00fedc221560fda31653c23a8f3d0eda78095c87519f338d4f4088e2ee9a9c0
 conflicts="oce>=0"
 
 post_install() {

srcpkgs/occt/update

@@ -0,0 +1,2 @@
+site="https://git.dev.opencascade.org/gitweb/?p=occt.git;a=tags"
+pattern=">V\K[\d_p]+(?=</a>)"