build: tweak the find modules even more

As described in
https://github.com/yuzu-emu/yuzu/pull/9395#discussion_r1047456172
checking for PKG_CONFIG_FOUND before calling pkg_search_module() is
unneeded, and some find modules (like FindFFmpeg.cmake) don't do this
already. Consequently, this patch removes these checks.

externals/find-modules/FindOpus.cmake

@@ -2,9 +2,7 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 find_package(PkgConfig QUIET)
-if (PKG_CONFIG_FOUND)
-    pkg_search_module(OPUS QUIET IMPORTED_TARGET opus)
-endif()
+pkg_search_module(OPUS QUIET IMPORTED_TARGET opus)
 
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args(Opus

externals/find-modules/Findenet.cmake

@@ -3,9 +3,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 find_package(PkgConfig QUIET)
-if (PKG_CONFIG_FOUND)
-    pkg_search_module(ENET QUIET IMPORTED_TARGET libenet)
-endif()
+pkg_search_module(ENET QUIET IMPORTED_TARGET libenet)
 
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args(enet

externals/find-modules/Findhttplib.cmake

@@ -9,9 +9,7 @@ if (httplib_FOUND)
     find_package_handle_standard_args(httplib CONFIG_MODE)
 else()
     find_package(PkgConfig QUIET)
-    if (PKG_CONFIG_FOUND)
-        pkg_search_module(HTTPLIB QUIET IMPORTED_TARGET cpp-httplib)
-    endif()
+    pkg_search_module(HTTPLIB QUIET IMPORTED_TARGET cpp-httplib)
     find_package_handle_standard_args(httplib
         REQUIRED_VARS HTTPLIB_INCLUDEDIR
         VERSION_VAR HTTPLIB_VERSION

externals/find-modules/Findinih.cmake

@@ -3,9 +3,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 find_package(PkgConfig QUIET)
-if (PKG_CONFIG_FOUND)
-    pkg_search_module(INIREADER QUIET IMPORTED_TARGET INIReader)
-endif()
+pkg_search_module(INIREADER QUIET IMPORTED_TARGET INIReader)
 
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args(inih

externals/find-modules/Findlibusb.cmake

@@ -3,9 +3,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 find_package(PkgConfig QUIET)
-if (PKG_CONFIG_FOUND)
-    pkg_search_module(LIBUSB QUIET IMPORTED_TARGET libusb-1.0)
-endif()
+pkg_search_module(LIBUSB QUIET IMPORTED_TARGET libusb-1.0)
 
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args(libusb

externals/find-modules/Findlz4.cmake

@@ -8,9 +8,7 @@ if (lz4_FOUND)
     find_package_handle_standard_args(lz4 CONFIG_MODE)
 else()
     find_package(PkgConfig QUIET)
-    if (PKG_CONFIG_FOUND)
-        pkg_search_module(LZ4 QUIET IMPORTED_TARGET liblz4)
-    endif()
+    pkg_search_module(LZ4 QUIET IMPORTED_TARGET liblz4)
     find_package_handle_standard_args(lz4
         REQUIRED_VARS LZ4_LINK_LIBRARIES
         VERSION_VAR LZ4_VERSION

externals/find-modules/Findzstd.cmake

@@ -8,9 +8,7 @@ if (zstd_FOUND)
     find_package_handle_standard_args(zstd CONFIG_MODE)
 else()
     find_package(PkgConfig QUIET)
-    if (PKG_CONFIG_FOUND)
-        pkg_search_module(ZSTD QUIET IMPORTED_TARGET libzstd)
-    endif()
+    pkg_search_module(ZSTD QUIET IMPORTED_TARGET libzstd)
     find_package_handle_standard_args(zstd
         REQUIRED_VARS ZSTD_LINK_LIBRARIES
         VERSION_VAR ZSTD_VERSION