gnu: glslang: Install all libraries.

* gnu/packages/patches/glslang-install-static-libs.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/vulkan.scm (glslang)[source](patches): New field.

gnu/local.mk

@@ -1249,6 +1249,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/glibc-2.29-supported-locales.patch     	\
   %D%/packages/patches/glibc-static-nss.patch			\
   %D%/packages/patches/glibc-supported-locales.patch     	\
+  %D%/packages/patches/glslang-install-static-libs.patch     	\
   %D%/packages/patches/gmp-arm-asm-nothumb.patch		\
   %D%/packages/patches/gmp-faulty-test.patch			\
   %D%/packages/patches/gnash-fix-giflib-version.patch	        \

gnu/packages/patches/glslang-install-static-libs.patch

@@ -0,0 +1,61 @@
+Install OGLCompiler et.al. even when building shared libraries.  Also fix
+CMake file locations.
+
+Patch taken from Gentoo:
+
+  https://gitweb.gentoo.org/repo/gentoo.git/tree/dev-util/glslang/files/glslang-1.3.231-Install-static-libs.patch
+
+diff --git a/OGLCompilersDLL/CMakeLists.txt b/OGLCompilersDLL/CMakeLists.txt
+--- a/OGLCompilersDLL/CMakeLists.txt
++++ b/OGLCompilersDLL/CMakeLists.txt
+@@ -41,7 +41,7 @@ if(WIN32)
+     source_group("Source" FILES ${SOURCES})
+ endif(WIN32)
+ 
+-if(ENABLE_GLSLANG_INSTALL AND NOT BUILD_SHARED_LIBS)
++if(ENABLE_GLSLANG_INSTALL)
+     install(TARGETS OGLCompiler EXPORT glslang-targets)
+ 
+     # Backward compatibility
+@@ -49,7 +49,7 @@ if(ENABLE_GLSLANG_INSTALL AND NOT BUILD_SHARED_LIBS)
+         message(WARNING \"Using `OGLCompilerTargets.cmake` is deprecated: use `find_package(glslang)` to find glslang CMake targets.\")
+ 
+         if (NOT TARGET glslang::OGLCompiler)
+-            include(\"\${CMAKE_CURRENT_LIST_DIR}/../../${CMAKE_INSTALL_LIBDIR}/${PROJECT_NAME}/glslang-targets.cmake\")
++            include(\"\${CMAKE_CURRENT_LIST_DIR}/../../${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}/glslang-targets.cmake\")
+         endif()
+ 
+         add_library(OGLCompiler ALIAS glslang::OGLCompiler)
+diff --git a/glslang/CMakeLists.txt b/glslang/CMakeLists.txt
+--- a/glslang/CMakeLists.txt
++++ b/glslang/CMakeLists.txt
+@@ -203,7 +203,7 @@ endif()
+ ################################################################################
+ if(ENABLE_GLSLANG_INSTALL)
+     install(TARGETS glslang EXPORT glslang-targets)
+-    if(NOT BUILD_SHARED_LIBS)
++    if(BUILD_SHARED_LIBS)
+         install(TARGETS MachineIndependent EXPORT glslang-targets)
+         install(TARGETS GenericCodeGen EXPORT glslang-targets)
+ 
+diff --git a/glslang/OSDependent/Unix/CMakeLists.txt b/glslang/OSDependent/Unix/CMakeLists.txt
+--- a/glslang/OSDependent/Unix/CMakeLists.txt
++++ b/glslang/OSDependent/Unix/CMakeLists.txt
+@@ -52,7 +52,7 @@ else()
+     target_link_libraries(OSDependent Threads::Threads)
+ endif()
+ 
+-if(ENABLE_GLSLANG_INSTALL AND NOT BUILD_SHARED_LIBS)
++if(ENABLE_GLSLANG_INSTALL)
+     install(TARGETS OSDependent EXPORT glslang-targets)
+ 
+     # Backward compatibility
+@@ -60,7 +60,7 @@ if(ENABLE_GLSLANG_INSTALL AND NOT BUILD_SHARED_LIBS)
+         message(WARNING \"Using `OSDependentTargets.cmake` is deprecated: use `find_package(glslang)` to find glslang CMake targets.\")
+ 
+         if (NOT TARGET glslang::OSDependent)
+-            include(\"\${CMAKE_CURRENT_LIST_DIR}/../../${CMAKE_INSTALL_LIBDIR}/${PROJECT_NAME}/glslang-targets.cmake\")
++            include(\"\${CMAKE_CURRENT_LIST_DIR}/../../${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}/glslang-targets.cmake\")
+         endif()
+ 
+         add_library(OSDependent ALIAS glslang::OSDependent)

gnu/packages/vulkan.scm

@@ -161,6 +161,7 @@ (define-public glslang
        (uri (git-reference
              (url "https://github.com/KhronosGroup/glslang")
              (commit version)))
+       (patches (search-patches "glslang-install-static-libs.patch"))
        (sha256
         (base32
          "12a1zl8qxa28nbf6m67260c0lwdw3bqbj0jz1382wgm5px1fpqw6"))