Improve build instructions and prerequisites so building opencv and llm are not skipped

[saket424]

(venv3) anand@tufb2lap:~/ion-kit-stuff/ion-kit/build$ cmake -D CMAKE_TOOLCHAIN_FILE=${VCPKG_PATH}/scripts/buildsystems/vcpkg.cmake -D Halide_DIR=${HALIDE_PATH}/lib/cmake/Halide -D HalideHelpers_DIR=${HALIDE_PATH}/lib/cmake/HalideHelpers -DCMAKE_BUILD_TYPE=Release -D ION_BUILD_TEST=ON -D ION_BUILD_EXAMPLE=ON ..
cmake --build .
-- Running vcpkg install
Detecting compiler hash for triplet x64-linux...
Compiler found: /usr/bin/c++
All requested packages are currently installed.
Total install time: 230 ns
libjpeg-turbo is compatible with built-in implementation-agnostic CMake targets:

    find_package(JPEG REQUIRED)
    target_include_directories(main PRIVATE JPEG::JPEG)

libjpeg-turbo provides CMake targets for the TurboJPEG C API:

    find_package(libjpeg-turbo CONFIG REQUIRED)
    target_link_libraries(main PRIVATE $<IF:$<TARGET_EXISTS:libjpeg-turbo::turbojpeg>,libjpeg-turbo::turbojpeg,libjpeg-turbo::turbojpeg-static>)

The package zlib is compatible with built-in CMake targets:

    find_package(ZLIB REQUIRED)
    target_link_libraries(main PRIVATE ZLIB::ZLIB)

The package libpng is compatible with built-in CMake targets:

    find_package(PNG REQUIRED)
    target_link_libraries(main PRIVATE PNG::PNG)

-- Running vcpkg install - done
-- Halide 'host' platform triple:   x86-64-linux
-- Halide 'cmake' platform triple:  x86-64-linux
-- Halide default AOT target:       host
CMake Warning (dev) at /home/anand/ion-kit-stuff/vcpkg/scripts/buildsystems/vcpkg.cmake:859 (_find_package):
  Policy CMP0146 is not set: The FindCUDA module is removed.  Run "cmake
  --help-policy CMP0146" for policy details.  Use the cmake_policy command to
  set the policy and suppress this warning.

Call Stack (most recent call first):
  CMakeLists.txt:33 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Version: v1.7.0-40-gd021033
Skip building "dnn"
Skip building "fpga"
Skip building "opencv"
Skip building "llm"
-- Configuring done (0.6s)
-- Generating done (0.0s)
-- Build files have been written to: /home/anand/ion-kit-stuff/ion-kit/build
[ 13%] Built target ion-core
[ 15%] Linking CXX shared library libion-bb.so
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[ 17%] Linking CXX shared library libion-bb-test.so
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Passed
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Passed
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[100%] Built target producerx3_aot
(venv3) anand@tufb2lap:~/ion-kit-stuff/ion-kit/build$