fix(main/libceres-solver): do not check / folder in CeresConfig.cmake

- Fixes this error during the build of Blender 5.1 on devices which do not allow permission to access the `/` folder:

```
CMake Error at /data/data/com.termux/files/usr/lib/cmake/Ceres/CeresConfig.cmake:85 (message):
  Failed to find Ceres - Ceres install root: /, determined from relative path
  from CeresConfig.cmake install location:
  /data/data/com.termux/files/usr/lib/cmake/Ceres, does not exist.  Either
  the install directory was deleted, or the install tree was only partially
  relocated outside of CMake after Ceres was built.
```

Author: robertkirkman

packages/libceres-solver/0001-do-not-check-root.patch

@@ -0,0 +1,21 @@
+Fixes this error when building blender 5.1 on devices which do not allow
+permission to access the '/' folder:
+
+CMake Error at /data/data/com.termux/files/usr/lib/cmake/Ceres/CeresConfig.cmake:85 (message):
+  Failed to find Ceres - Ceres install root: /, determined from relative path
+  from CeresConfig.cmake install location:
+  /data/data/com.termux/files/usr/lib/cmake/Ceres, does not exist.  Either
+  the install directory was deleted, or the install tree was only partially
+  relocated outside of CMake after Ceres was built. 
+
+--- a/cmake/CeresConfig.cmake.in
++++ b/cmake/CeresConfig.cmake.in
+@@ -143,7 +143,7 @@ if (CERES_WAS_INSTALLED)
+   get_filename_component(CURRENT_ROOT_INSTALL_DIR
+     "${CERES_CURRENT_CONFIG_DIR}/@INSTALL_ROOT_REL_CONFIG_INSTALL_DIR@"
+     ABSOLUTE)
+-  if (NOT EXISTS ${CURRENT_ROOT_INSTALL_DIR})
++  if (NOT EXISTS ${CURRENT_ROOT_INSTALL_DIR} AND NOT ANDROID)
+     ceres_report_not_found(
+       "Ceres install root: ${CURRENT_ROOT_INSTALL_DIR}, "
+       "determined from relative path from CeresConfig.cmake install location: "

packages/libceres-solver/build.sh

@@ -4,7 +4,7 @@ TERMUX_PKG_GROUPS="science"
 TERMUX_PKG_LICENSE="BSD 3-Clause"
 TERMUX_PKG_MAINTAINER="@termux"
 TERMUX_PKG_VERSION="2.2.0"
-TERMUX_PKG_REVISION=3
+TERMUX_PKG_REVISION=4
 TERMUX_PKG_SRCURL="http://ceres-solver.org/ceres-solver-$TERMUX_PKG_VERSION.tar.gz"
 TERMUX_PKG_SHA256=48b2302a7986ece172898477c3bcd6deb8fb5cf19b3327bc49969aad4cede82d
 TERMUX_PKG_DEPENDS="libc++, eigen, google-glog, gflags"