Use the `-l` form for MinGW-specific link dependencies

This corrects the generated .pc files, so these libs match the other libs
already included there.

absl/base/CMakeLists.txt

@@ -201,7 +201,7 @@ absl_cc_library(
   LINKOPTS
   LINKOPTS
     ${ABSL_DEFAULT_LINKOPTS}
     ${ABSL_DEFAULT_LINKOPTS}
     $<$<BOOL:${LIBRT}>:-lrt>
     $<$<BOOL:${LIBRT}>:-lrt>
-    $<$<BOOL:${MINGW}>:"advapi32">
+    $<$<BOOL:${MINGW}>:-ladvapi32>
   DEPS
   DEPS
     absl::atomic_hook
     absl::atomic_hook
     absl::base_internal
     absl::base_internal

absl/debugging/CMakeLists.txt

@@ -62,7 +62,7 @@ absl_cc_library(
     ${ABSL_DEFAULT_COPTS}
     ${ABSL_DEFAULT_COPTS}
   LINKOPTS
   LINKOPTS
     ${ABSL_DEFAULT_LINKOPTS}
     ${ABSL_DEFAULT_LINKOPTS}
-    $<$<BOOL:${MINGW}>:"dbghelp">
+    $<$<BOOL:${MINGW}>:-ldbghelp>
   DEPS
   DEPS
     absl::debugging_internal
     absl::debugging_internal
     absl::demangle_internal
     absl::demangle_internal

absl/random/CMakeLists.txt

@@ -569,7 +569,7 @@ absl_cc_library(
     ${ABSL_DEFAULT_COPTS}
     ${ABSL_DEFAULT_COPTS}
   LINKOPTS
   LINKOPTS
     ${ABSL_DEFAULT_LINKOPTS}
     ${ABSL_DEFAULT_LINKOPTS}
-    $<$<BOOL:${MINGW}>:"bcrypt">
+    $<$<BOOL:${MINGW}>:-lbcrypt>
   DEPS
   DEPS
     absl::core_headers
     absl::core_headers
     absl::optional
     absl::optional